diff --git a/internal/sim/effect.go b/internal/sim/effect.go
index 8f7fce8..5bdbe74 100644
--- a/internal/sim/effect.go
+++ b/internal/sim/effect.go
@@ -3,7 +3,7 @@ package sim
 import "github.com/jordanorelli/astro-domu/internal/wire"
 
 type Effect interface {
-	wire.Value
+	//wire.Value
 	exec(*room, *player, int) result
 }
 
diff --git a/internal/sim/player.go b/internal/sim/player.go
index ac056a0..27d90b6 100644
--- a/internal/sim/player.go
+++ b/internal/sim/player.go
@@ -1,6 +1,11 @@
 package sim
 
 import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/gorilla/websocket"
 	"github.com/jordanorelli/astro-domu/internal/math"
 	"github.com/jordanorelli/astro-domu/internal/wire"
 	"github.com/jordanorelli/blammo"
@@ -8,75 +13,14 @@ import (
 
 type player struct {
 	*blammo.Log
-	*room
+	//*room
 	name    string
 	outbox  chan wire.Response
 	pending *Request
 	avatar  *entity
 }
 
-type Move math.Vec
-
-func (Move) NetTag() string { return "move" }
-
-func (m *Move) exec(r *room, p *player, seq int) result {
-	pos := p.avatar.Position
-	target := pos.Add(math.Vec(*m))
-	p.Info("running move for player %s from %v to %v", p.name, *m, target)
-	if !p.room.Contains(target) {
-		return result{reply: wire.Errorf("target cell (%d, %d) is out of bounds", target.X, target.Y)}
-	}
-
-	currentTile := r.getTile(pos)
-	nextTile := r.getTile(target)
-	if nextTile.here != nil {
-		return result{reply: wire.Errorf("target cell (%d, %d) is occupied", target.X, target.Y)}
-	}
-
-	currentTile.here, nextTile.here = nil, p.avatar
-	p.avatar.Position = target
-	return result{reply: wire.OK{}}
-}
-
-// SpawnPlayer is a request to spawn a player
-type SpawnPlayer struct {
-	Outbox chan wire.Response
-	Name   string
-	queued bool
-}
-
-var lastEntityID = 0
-
-func (s *SpawnPlayer) exec(r *room, p *player, seq int) result {
-	if !s.queued {
-		r.Info("spawn player requested for: %s", s.Name)
-
-		if _, ok := r.players[s.Name]; ok {
-			s.Outbox <- wire.ErrorResponse(seq, "a player is already logged in as %q", s.Name)
-			return result{}
-		}
-
-		lastEntityID++
-		avatar := &entity{
-			ID:       lastEntityID,
-			Position: math.Vec{0, 0},
-			Glyph:    '@',
-			behavior: doNothing{},
-		}
-		p := &player{
-			Log:    r.Log.Child("players").Child(s.Name),
-			room:   r,
-			name:   s.Name,
-			outbox: s.Outbox,
-			avatar: avatar,
-		}
-		p.pending = &Request{Seq: seq, From: s.Name, Wants: s}
-		r.players[s.Name] = p
-		r.tiles[0].here = p.avatar
-		s.queued = true
-		return result{}
-	}
-
+func (p *player) start(c chan Request, conn *websocket.Conn, r *room) {
 	welcome := wire.Welcome{
 		Rooms:   make(map[string]wire.Room),
 		Players: make(map[string]wire.Player),
@@ -95,26 +39,140 @@ func (s *SpawnPlayer) exec(r *room, p *player, seq int) result {
 		Entities: ents,
 	}
 	for _, p := range r.players {
-		welcome.Players[p.name] = wire.Player{
-			Name:   p.name,
-			Avatar: p.avatar.ID,
-			Room:   r.name,
+		wp := wire.Player{
+			Name: p.name,
+			Room: r.name,
 		}
+		if p.avatar != nil {
+			wp.Avatar = p.avatar.ID
+		}
+		welcome.Players[p.name] = wp
 	}
-	return result{
-		reply: welcome,
+	p.outbox <- wire.Response{Re: 1, Body: welcome}
+	go p.readLoop(c, conn)
+	go p.runLoop(conn)
+}
+
+func (p *player) readLoop(c chan Request, conn *websocket.Conn) {
+	for {
+		_, b, err := conn.ReadMessage()
+		if err != nil {
+			p.Error("read error: %v", err)
+			conn.Close()
+			return
+		}
+		p.Log.Child("received-frame").Info(string(b))
+
+		var req wire.Request
+		if err := json.Unmarshal(b, &req); err != nil {
+			p.Error("unable to parse request: %v", err)
+			continue
+		}
+		// sn.Info("received message of type %T", req.Body)
+
+		effect, ok := req.Body.(Effect)
+		if !ok {
+			continue
+		}
+		c <- Request{
+			From:  p.name,
+			Seq:   req.Seq,
+			Wants: effect,
+		}
+	}
+
+}
+
+func (p *player) runLoop(conn *websocket.Conn) {
+	for {
+		select {
+		case res := <-p.outbox:
+			if err := sendResponse(conn, res); err != nil {
+				p.Error(err.Error())
+			}
+		}
+		// case sendCloseFrame := <-sn.done:
+		// 	sn.Info("saw done signal")
+		// 	if sendCloseFrame {
+		// 		sn.Info("sending close frame")
+		// 		msg := websocket.FormatCloseMessage(websocket.CloseNormalClosure, "")
+		// 		if err := sn.conn.WriteMessage(websocket.CloseMessage, msg); err != nil {
+		// 			sn.Error("failed to write close message: %v", err)
+		// 		} else {
+		// 			sn.Info("sent close frame")
+		// 		}
+		// 	}
+		// 	return
+		// }
+	}
+}
+
+func sendResponse(conn *websocket.Conn, res wire.Response) error {
+	payload, err := json.Marshal(res)
+	if err != nil {
+		return fmt.Errorf("failed to marshal outgoing response: %w", err)
+	}
+
+	if err := conn.SetWriteDeadline(time.Now().Add(3 * time.Second)); err != nil {
+		return fmt.Errorf("failed to set write deadline: %w", err)
+	}
+
+	w, err := conn.NextWriter(websocket.TextMessage)
+	if err != nil {
+		return fmt.Errorf("failed get a writer frame: %w", err)
+	}
+	if _, err := w.Write(payload); err != nil {
+		return fmt.Errorf("failed write payload: %w", err)
+	}
+	if err := w.Close(); err != nil {
+		return fmt.Errorf("failed to close write frame: %w", err)
+	}
+	return nil
+}
+
+type spawnPlayer struct{}
+
+func (s spawnPlayer) exec(r *room, p *player, seq int) result {
+	for n, t := range r.tiles {
+		if t.here == nil {
+			x, y := n%r.Width, n/r.Width
+			e := entity{
+				Position: math.Vec{x, y},
+				Glyph:    '@',
+				behavior: doNothing{},
+			}
+			p.avatar = &e
+			t.here = &e
+			break
+		}
 	}
+	return result{}
 }
 
-func (SpawnPlayer) NetTag() string { return "player/spawn" }
+type Move math.Vec
+
+func (Move) NetTag() string { return "move" }
+
+func (m *Move) exec(r *room, p *player, seq int) result {
+	pos := p.avatar.Position
+	target := pos.Add(math.Vec(*m))
+	p.Info("running move for player %s from %v to %v", p.name, *m, target)
+	if !r.Contains(target) {
+		return result{reply: wire.Errorf("target cell (%d, %d) is out of bounds", target.X, target.Y)}
+	}
 
-// PlayerSpawned is an announcement that a player has spawned
-type PlayerSpawned struct {
-	Name     string `json:"name"`
-	Position [2]int `json:"position"`
+	currentTile := r.getTile(pos)
+	nextTile := r.getTile(target)
+	if nextTile.here != nil {
+		return result{reply: wire.Errorf("target cell (%d, %d) is occupied", target.X, target.Y)}
+	}
+
+	currentTile.here, nextTile.here = nil, p.avatar
+	p.avatar.Position = target
+	return result{reply: wire.OK{}}
 }
 
-func (PlayerSpawned) NetTag() string { return "player/spawned" }
+var lastEntityID = 0
 
 func init() {
 	wire.Register(func() wire.Value { return new(Move) })
diff --git a/internal/sim/server.go b/internal/sim/server.go
index af1f66c..5b992c2 100644
--- a/internal/sim/server.go
+++ b/internal/sim/server.go
@@ -2,10 +2,10 @@ package sim
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net"
 	"net/http"
-	"strconv"
 	"sync"
 	"time"
 
@@ -19,11 +19,6 @@ type Server struct {
 	*blammo.Log
 	http  *http.Server
 	world *world
-
-	sync.Mutex
-	lastSessionID  int
-	sessions       map[int]*session
-	waitOnSessions sync.WaitGroup
 }
 
 func (s *Server) Start(host string, port int) error {
@@ -32,7 +27,7 @@ func (s *Server) Start(host string, port int) error {
 	}
 
 	s.world = newWorld(s.Log.Child("world"))
-	go s.world.run(3)
+	go s.world.run(30)
 
 	addr := fmt.Sprintf("%s:%d", host, port)
 	lis, err := net.Listen("tcp", addr)
@@ -57,59 +52,65 @@ func (s *Server) runHTTPServer(lis net.Listener) {
 	}
 }
 
-func (s *Server) createSession(conn *websocket.Conn) *session {
-	s.Lock()
-	defer s.Unlock()
-
-	s.lastSessionID++
-	sn := &session{
-		Log:    s.Log.Child("sessions").Child(strconv.Itoa(s.lastSessionID)),
-		id:     s.lastSessionID,
-		start:  time.Now(),
-		conn:   conn,
-		outbox: make(chan wire.Response),
-		done:   make(chan bool, 1),
-	}
-	if s.sessions == nil {
-		s.sessions = make(map[int]*session)
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log := s.Log.Child("login")
+	upgrader := websocket.Upgrader{
+		HandshakeTimeout: 3 * time.Second,
+		ReadBufferSize:   2 << 12,
+		WriteBufferSize:  2 << 12,
+		Subprotocols:     []string{"astrodomu@v0"},
 	}
-	s.waitOnSessions.Add(1)
-	s.sessions[sn.id] = sn
-	// sn.entityID = s.world.SpawnPlayer(sn.id)
-	// s.Info("created session %d, %d sessions active", sn.id, len(s.sessions))
-	return sn
-}
 
-// dropSession removes a session from the server. This should only be called as
-// a result of the connection's read loop terminating
-func (s *Server) dropSession(sn *session) {
-	s.Lock()
-	defer s.Unlock()
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Error("upgrade error: %v", err)
+		return
+	}
 
-	close(sn.done)
-	delete(s.sessions, sn.id)
-	s.waitOnSessions.Add(-1)
+	t, rd, err := conn.NextReader()
+	if err != nil {
+		log.Error("unable to get a reader: %v", err)
+		conn.Close()
+		return
+	}
 
-	s.Info("dropped session %d after %v time connected, %d sessions active", sn.id, time.Since(sn.start), len(s.sessions))
-}
+	if t != websocket.TextMessage {
+		log.Error("first message is not text")
+		// TODO: send websocket close frame here
+		conn.Close()
+		return
+	}
 
-func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	upgrader := websocket.Upgrader{}
+	var req wire.Request
+	if err := json.NewDecoder(rd).Decode(&req); err != nil {
+		log.Error("unable to parse initial request: %v", err)
+		// TODO: send websocket close frame here
+		conn.Close()
+		return
+	}
 
-	conn, err := upgrader.Upgrade(w, r, nil)
-	if err != nil {
-		s.Error("upgrade error: %v", err)
+	login, ok := req.Body.(*wire.Login)
+	if !ok {
+		log.Error("first request is not wire.Login, is %T", req.Body)
+		// TODO: send websocket close frame here
+		conn.Close()
 		return
 	}
 
-	sn := s.createSession(conn)
-	go sn.run()
-	sn.read(s.world.Inbox)
-	s.dropSession(sn)
+	log.Info("login requested: %v", *login)
 
-	sn.Info("closing connection")
-	if err := conn.Close(); err != nil {
-		s.Error("error closing connection: %v", err)
+	failed := make(chan error, 1)
+	s.world.connect <- connect{
+		conn:   conn,
+		login:  *login,
+		failed: failed,
+	}
+	e := <-failed
+	if e != nil {
+		log.Error("connect failed: %v", err)
+		// TODO: send websocket close frame here
+		conn.Close()
+		return
 	}
 }
 
@@ -117,7 +118,7 @@ func (s *Server) Shutdown() {
 	s.Info("starting shutdown procedure")
 
 	var wg sync.WaitGroup
-	wg.Add(3)
+	wg.Add(2)
 	go func() {
 		defer wg.Done()
 
@@ -138,29 +139,6 @@ func (s *Server) Shutdown() {
 		}
 	}()
 
-	go func() {
-		defer wg.Done()
-
-		log := s.Child("sessions")
-		s.Lock()
-		numSessions := len(s.sessions)
-		if numSessions > 0 {
-			log.Info("broadcasting shutdown to %d active sessions", numSessions)
-			for id, sn := range s.sessions {
-				log.Info("sending done signal to session: %d", id)
-				sn.done <- true
-			}
-		} else {
-			log.Info("no active sessions")
-		}
-		s.Unlock()
-
-		if numSessions > 0 {
-			log.Info("waiting on %d connected sessions to shut down", numSessions)
-		}
-		s.waitOnSessions.Wait()
-		log.Info("all sessions have shut down")
-	}()
 	wg.Wait()
 	s.Info("shutdown procedure complete")
 }
diff --git a/internal/sim/session.go b/internal/sim/session.go
deleted file mode 100644
index 0d8f941..0000000
--- a/internal/sim/session.go
+++ /dev/null
@@ -1,154 +0,0 @@
-package sim
-
-import (
-	"encoding/json"
-	"fmt"
-	"time"
-
-	"github.com/gorilla/websocket"
-	"github.com/jordanorelli/astro-domu/internal/wire"
-	"github.com/jordanorelli/blammo"
-)
-
-type session struct {
-	*blammo.Log
-	Name     string
-	id       int
-	entityID int
-	start    time.Time
-	conn     *websocket.Conn
-	outbox   chan wire.Response
-	done     chan bool
-}
-
-// run is the session run loop.
-func (sn *session) run() {
-	for {
-		select {
-		case res := <-sn.outbox:
-			if err := sn.sendResponse(res); err != nil {
-				sn.Error(err.Error())
-			}
-		case sendCloseFrame := <-sn.done:
-			sn.Info("saw done signal")
-			if sendCloseFrame {
-				sn.Info("sending close frame")
-				msg := websocket.FormatCloseMessage(websocket.CloseNormalClosure, "")
-				if err := sn.conn.WriteMessage(websocket.CloseMessage, msg); err != nil {
-					sn.Error("failed to write close message: %v", err)
-				} else {
-					sn.Info("sent close frame")
-				}
-			}
-			return
-		}
-	}
-}
-
-// read reads for messages on the underlying websocket.
-func (sn *session) read(c chan Request) {
-	for {
-		t, b, err := sn.conn.ReadMessage()
-		if err != nil {
-			if v, ok := err.(*websocket.CloseError); ok {
-				switch v.Code {
-				case websocket.CloseNormalClosure,
-					websocket.CloseGoingAway:
-					sn.Info("received close frame with code %d (%v)", v.Code, err)
-				case websocket.CloseNoStatusReceived,
-					websocket.CloseProtocolError,
-					websocket.CloseUnsupportedData,
-					websocket.CloseAbnormalClosure,
-					websocket.CloseInvalidFramePayloadData,
-					websocket.ClosePolicyViolation,
-					websocket.CloseMessageTooBig,
-					websocket.CloseMandatoryExtension,
-					websocket.CloseInternalServerErr,
-					websocket.CloseServiceRestart,
-					websocket.CloseTryAgainLater,
-					websocket.CloseTLSHandshake:
-					sn.Error("received close frame with code %d (%v)", v.Code, err)
-				default:
-					sn.Error("received close frame with code %d (%v)", v.Code, err)
-				}
-				return
-			}
-			sn.Error("unexpected read error: %v", err)
-			return
-		}
-
-		switch t {
-		case websocket.TextMessage:
-			sn.Log.Child("received-frame").Info(string(b))
-
-			var req wire.Request
-			if err := json.Unmarshal(b, &req); err != nil {
-				sn.Error("unable to parse request: %v", err)
-				sn.enqueue(wire.ErrorResponse(req.Seq, "unable to parse request: %v", err))
-				break
-			}
-			sn.Info("received message of type %T", req.Body)
-
-			switch v := req.Body.(type) {
-			case *wire.Login:
-				sn.Name = v.Name
-				c <- Request{
-					From: sn.Name,
-					Seq:  req.Seq,
-					Wants: &SpawnPlayer{
-						Name:   sn.Name,
-						Outbox: sn.outbox,
-					},
-				}
-			case Effect:
-				c <- Request{
-					From:  sn.Name,
-					Seq:   req.Seq,
-					Wants: v,
-				}
-			default:
-				sn.enqueue(wire.ErrorResponse(req.Seq, "not sure how to handle that"))
-			}
-		case websocket.BinaryMessage:
-			sn.enqueue(wire.ErrorResponse(0, "unable to parse binary frames"))
-		}
-	}
-}
-
-// sendResponse sends an individual response on the underlying websocket connection
-func (sn *session) sendResponse(res wire.Response) error {
-	payload, err := json.Marshal(res)
-	if err != nil {
-		return fmt.Errorf("failed to marshal outgoing response: %w", err)
-	}
-
-	if err := sn.conn.SetWriteDeadline(time.Now().Add(3 * time.Second)); err != nil {
-		return fmt.Errorf("failed to set write deadline: %w", err)
-	}
-
-	w, err := sn.conn.NextWriter(websocket.TextMessage)
-	if err != nil {
-		return fmt.Errorf("failed get a writer frame: %w", err)
-	}
-	if _, err := w.Write(payload); err != nil {
-		return fmt.Errorf("failed write payload: %w", err)
-	}
-	if err := w.Close(); err != nil {
-		return fmt.Errorf("failed to close write frame: %w", err)
-	}
-	sn.Child("sent-frame").Info(string(payload))
-	return nil
-}
-
-func (sn *session) enqueue(res wire.Response) {
-	select {
-	case sn.outbox <- res:
-		return
-	default:
-		select {
-		case <-sn.outbox:
-			sn.enqueue(res)
-		default:
-		}
-	}
-}
diff --git a/internal/sim/world.go b/internal/sim/world.go
index 2324c5d..f4fd752 100644
--- a/internal/sim/world.go
+++ b/internal/sim/world.go
@@ -1,8 +1,10 @@
 package sim
 
 import (
+	"fmt"
 	"time"
 
+	"github.com/gorilla/websocket"
 	"github.com/jordanorelli/astro-domu/internal/math"
 	"github.com/jordanorelli/astro-domu/internal/wire"
 	"github.com/jordanorelli/blammo"
@@ -11,14 +13,21 @@ import (
 // world is the entire simulated world. A world consists of many rooms.
 type world struct {
 	*blammo.Log
-	Inbox chan Request
+	inbox   chan Request
+	connect chan connect
 
-	rooms        []room
 	done         chan bool
 	lastEntityID int
+	rooms        map[string]*room
 	players      map[string]*player
 }
 
+type connect struct {
+	conn   *websocket.Conn
+	login  wire.Login
+	failed chan error
+}
+
 func newWorld(log *blammo.Log) *world {
 	bounds := math.CreateRect(10, 10)
 	foyer := room{
@@ -37,9 +46,10 @@ func newWorld(log *blammo.Log) *world {
 	log.Info("created foyer with bounds: %#v having width: %d height: %d area: %d", foyer.Rect, foyer.Width, foyer.Height, foyer.Area())
 	return &world{
 		Log:     log,
-		rooms:   []room{foyer},
+		rooms:   map[string]*room{"foyer": &foyer},
 		done:    make(chan bool),
-		Inbox:   make(chan Request),
+		inbox:   make(chan Request),
+		connect: make(chan connect),
 		players: make(map[string]*player),
 	}
 }
@@ -54,7 +64,10 @@ func (w *world) run(hz int) {
 
 	for {
 		select {
-		case req := <-w.Inbox:
+		case c := <-w.connect:
+			w.register(c)
+
+		case req := <-w.inbox:
 			w.Info("read from inbox: %v", req)
 
 			if req.From == "" {
@@ -62,17 +75,6 @@ func (w *world) run(hz int) {
 				break
 			}
 
-			if spawn, ok := req.Wants.(*SpawnPlayer); ok {
-				if _, ok := w.players[req.From]; ok {
-					spawn.Outbox <- wire.ErrorResponse(req.Seq, "a player is already logged in as %q", req.From)
-					break
-				}
-				spawn.exec(&w.rooms[0], nil, req.Seq)
-				p := w.rooms[0].players[req.From]
-				w.players[req.From] = p
-				break
-			}
-
 			p, ok := w.players[req.From]
 			if !ok {
 				w.Error("received non login request of type %T from unknown player %q", req.Wants, req.From)
@@ -94,6 +96,31 @@ func (w *world) run(hz int) {
 	}
 }
 
+func (w *world) register(c connect) {
+	w.Info("register: %#v", c.login)
+	foyer := w.rooms["foyer"]
+	if len(foyer.players) >= 100 {
+		c.failed <- fmt.Errorf("room is full")
+		close(c.failed)
+		return
+	}
+
+	p := player{
+		Log:    w.Log.Child("players").Child(c.login.Name),
+		name:   c.login.Name,
+		outbox: make(chan wire.Response, 8),
+		pending: &Request{
+			From:  c.login.Name,
+			Seq:   1,
+			Wants: &spawnPlayer{},
+		},
+	}
+	foyer.players[c.login.Name] = &p
+	w.players[c.login.Name] = &p
+
+	p.start(w.inbox, c.conn, foyer)
+}
+
 func (w *world) stop() error {
 	w.Info("stopping simulation")
 	w.done <- true
diff --git a/internal/wire/client.go b/internal/wire/client.go
index 40ab357..a419282 100644
--- a/internal/wire/client.go
+++ b/internal/wire/client.go
@@ -169,6 +169,7 @@ func (c *Client) writeLoop() {
 				c.Error("saw response for unknown seq %d")
 				break
 			}
+			delete(sent, res.Re)
 			p.res = res
 			close(p.done)