diff --git a/internal/app/ui.go b/internal/app/ui.go
index b37cfed..e916188 100644
--- a/internal/app/ui.go
+++ b/internal/app/ui.go
@@ -139,6 +139,9 @@ func (ui *UI) handleNotification(v wire.Value) bool {
 		if ui.room == nil {
 			ui.room = new(wire.Room)
 		}
+
+		ui.room.Name = n.RoomName
+		ui.room.Rect = n.RoomSize
 		ui.room.Entities = n.Entities
 		return true
 
diff --git a/internal/sim/door.go b/internal/sim/door.go
index 709ecc9..64b17f3 100644
--- a/internal/sim/door.go
+++ b/internal/sim/door.go
@@ -8,22 +8,96 @@ import (
 
 type door struct {
 	*blammo.Log
-	to   string
-	exit int
+	to      string
+	exit    int
+	arrived int
 }
 
 func (d *door) update(time.Duration) {}
 
+func (d *door) exec(w *world, r *room, p *player, seq int) result {
+	p.Info("executing door to %q for player %s", d.to, p.name)
+
+	dest, ok := w.rooms[d.to]
+	if !ok {
+		p.Error("door destination %q does not exist", d.to)
+		return result{}
+	}
+	p.Info("found destination room %q", d.to)
+
+	exit := dest.findEntity(d.exit)
+	if exit == nil {
+		p.Error("door exit %d does not exist", d.exit)
+		return result{}
+	}
+
+	exitDoor, ok := exit.behavior.(*door)
+	if !ok {
+		p.Error("exit entity %d is not a door", d.exit)
+		return result{}
+	}
+	p.Info("found exit door %v", exitDoor)
+
+	t := dest.getTile(exit.Position)
+	p.Info("exit tile: %v", t)
+	if t.isOccupied() {
+		p.Error("destination tile %v is occupied", t)
+		return result{}
+	}
+
+	p.Info("removing player from room %s", r.name)
+	r.removePlayer(p.name)
+	p.Info("adding player to room %s", dest.name)
+	if t.addEntity(p.avatar) {
+		p.Info("added player avatar to tile %v", t)
+		exitDoor.arrived = p.avatar.ID
+		p.avatar.Position = exit.Position
+	} else {
+		p.Error("failed to add player avatar to tile %v", t)
+	}
+	dest.addPlayer(p)
+	return result{}
+}
+
 func (d *door) onStartOverlap(e *entity) {
-	d.Info("start overlap: %v", e)
+	if e.ID == d.arrived {
+		return
+	}
+	if p, ok := e.behavior.(*player); ok {
+		d.Info("player %s start overlap on door to %s", p.name, d.to)
+		if p.pending != nil {
+			d.Info("player %s starting overlap on door to %s has a pending request", p.name, d.to)
+		} else {
+			d.Info("player %s starting overlap on door to %s has NO pending request", p.name, d.to)
+			p.pending = &Request{Wants: d}
+		}
+	}
 }
 
 func (d *door) onOverlap(e *entity) {
-	d.Info("overlap: %v", e)
+	if e.ID == d.arrived {
+		return
+	}
+	// d.Info("overlap: %v", e)
+	if p, ok := e.behavior.(*player); ok {
+		d.Info("player %s is continuing overlap on door to %s", p.name, d.to)
+		if p.pending != nil {
+			d.Info("player %s continuing to overlap door to %s has a pending request", p.name, d.to)
+		} else {
+			d.Info("player %s continuing to overlap door to %s has NO pending request", p.name, d.to)
+			p.pending = &Request{Wants: d}
+		}
+	}
 }
 
 func (d *door) onStopOverlap(e *entity) {
-	d.Info("stop overlap: %v", e)
+	if e.ID == d.arrived {
+		d.arrived = 0
+	}
+	// d.Info("stop overlap: %v", e)
+	if p, ok := e.behavior.(*player); ok {
+		d.Info("player %s stepped off of door to %s", p.name, d.to)
+	}
 }
 
 /*
diff --git a/internal/sim/effect.go b/internal/sim/effect.go
index d0997a5..8fb049a 100644
--- a/internal/sim/effect.go
+++ b/internal/sim/effect.go
@@ -6,6 +6,10 @@ type Effect interface {
 	exec(*world, *room, *player, int) result
 }
 
+type effect func(*world, *room, *player, int) result
+
+func (f effect) exec(w *world, r *room, p *player, seq int) result { return f(w, r, p, seq) }
+
 type result struct {
 	reply wire.Value
 }
diff --git a/internal/sim/player.go b/internal/sim/player.go
index ed5ec80..59479cf 100644
--- a/internal/sim/player.go
+++ b/internal/sim/player.go
@@ -97,6 +97,9 @@ func (p *player) runLoop(conn *websocket.Conn) {
 	for {
 		select {
 		case res := <-p.outbox:
+			if err, ok := res.Body.(error); ok {
+				p.Error("sending error: %s", err)
+			}
 			if err := sendResponse(conn, res); err != nil {
 				p.Error(err.Error())
 			}
@@ -152,6 +155,8 @@ func sendResponse(conn *websocket.Conn, res wire.Response) error {
 	return nil
 }
 
+func (p *player) update(dt time.Duration) {}
+
 type spawnPlayer struct{}
 
 func (s spawnPlayer) exec(w *world, r *room, p *player, seq int) result {
@@ -159,14 +164,16 @@ func (s spawnPlayer) exec(w *world, r *room, p *player, seq int) result {
 		ID:       <-w.nextID,
 		Glyph:    '@',
 		solid:    true,
-		behavior: doNothing{},
+		behavior: p,
 	}
 	p.avatar = &e
 
-	for n, t := range r.tiles {
+	for n, _ := range r.tiles {
+		t := &r.tiles[n]
 		x, y := n%r.Width, n/r.Width
 		e.Position = math.Vec{x, y}
 		if t.addEntity(&e) {
+			p.Info("player added to tile at %s", e.Position)
 			return result{}
 		}
 	}
@@ -182,15 +189,26 @@ func (m *Move) exec(w *world, r *room, p *player, seq int) result {
 	target := pos.Add(math.Vec(*m))
 	p.Info("running move for player %s from %v to %v", p.name, p.avatar.Position, target)
 	if !r.Contains(target) {
+		p.Error("target cell (%d, %d) is out of bounds", target.X, target.Y)
 		return result{reply: wire.Errorf("target cell (%d, %d) is out of bounds", target.X, target.Y)}
 	}
 
 	currentTile := r.getTile(pos)
+	if !currentTile.hasEntity(p.avatar.ID) {
+		p.Error("player cannot move off of %s because they were not actually there", pos)
+		p.Error("tile %d: %v", pos, currentTile)
+		return result{reply: wire.Errorf("player cannot move off of %s because they were not actually there", pos)}
+	}
+
 	nextTile := r.getTile(target)
-	if !nextTile.addEntity(p.avatar) {
+	if nextTile.isOccupied() {
+		p.Error("target cell (%d, %d) is occupied", target.X, target.Y)
 		return result{reply: wire.Errorf("target cell (%d, %d) is occupied", target.X, target.Y)}
 	}
+
 	currentTile.removeEntity(p.avatar.ID)
+	nextTile.addEntity(p.avatar)
+
 	p.avatar.Position = target
 	return result{reply: wire.OK{}}
 }
diff --git a/internal/sim/room.go b/internal/sim/room.go
index cbf7373..3fc0e50 100644
--- a/internal/sim/room.go
+++ b/internal/sim/room.go
@@ -36,6 +36,17 @@ func (r *room) playerAvatars() map[string]int {
 	return all
 }
 
+func (r *room) findEntity(id int) *entity {
+	for _, t := range r.tiles {
+		for _, e := range t.here {
+			if e.ID == id {
+				return e
+			}
+		}
+	}
+	return nil
+}
+
 func (r *room) addEntity(e *entity) bool {
 	t := r.getTile(e.Position)
 	if t == nil {
@@ -49,8 +60,12 @@ func (r *room) addPlayer(p *player) {
 }
 
 func (r *room) removePlayer(name string) bool {
-	if _, ok := r.players[name]; ok {
+	if p, ok := r.players[name]; ok {
 		delete(r.players, name)
+		t := r.getTile(p.avatar.Position)
+		if t != nil {
+			t.removeEntity(p.avatar.ID)
+		}
 		return true
 	}
 	return false
diff --git a/internal/sim/tile.go b/internal/sim/tile.go
index 2ca4ebf..872951c 100644
--- a/internal/sim/tile.go
+++ b/internal/sim/tile.go
@@ -1,6 +1,7 @@
 package sim
 
 import (
+	"fmt"
 	"time"
 )
 
@@ -9,6 +10,14 @@ type tile struct {
 	here  []*entity
 }
 
+func (t tile) String() string {
+	ids := make([]int, len(t.here))
+	for i, e := range t.here {
+		ids[i] = e.ID
+	}
+	return fmt.Sprintf("{%c %v}", t.floor, ids)
+}
+
 func (t *tile) addEntity(e *entity) bool {
 	if e.solid {
 		for _, other := range t.here {
@@ -21,7 +30,8 @@ func (t *tile) addEntity(e *entity) bool {
 	return true
 }
 
-func (t *tile) removeEntity(id int) {
+func (t *tile) removeEntity(id int) bool {
+	start := len(t.here)
 	here := t.here[:0]
 	for _, e := range t.here {
 		if e.ID != id {
@@ -29,6 +39,25 @@ func (t *tile) removeEntity(id int) {
 		}
 	}
 	t.here = here
+	return len(t.here) != start
+}
+
+func (t *tile) hasEntity(id int) bool {
+	for _, e := range t.here {
+		if e.ID == id {
+			return true
+		}
+	}
+	return false
+}
+
+func (t *tile) isOccupied() bool {
+	for _, e := range t.here {
+		if e.solid {
+			return true
+		}
+	}
+	return false
 }
 
 func (t *tile) update(d time.Duration) {
diff --git a/internal/sim/world.go b/internal/sim/world.go
index 014ed18..d5a1f81 100644
--- a/internal/sim/world.go
+++ b/internal/sim/world.go
@@ -247,6 +247,8 @@ func (w *world) tick(d time.Duration) {
 	// send frame data to all players
 	for _, r := range w.rooms {
 		frame := wire.Frame{
+			RoomName: r.name,
+			RoomSize: r.Rect,
 			Entities: r.allEntities(),
 			Players:  r.playerAvatars(),
 		}
diff --git a/internal/wire/frame.go b/internal/wire/frame.go
index f567121..4a8cfd1 100644
--- a/internal/wire/frame.go
+++ b/internal/wire/frame.go
@@ -1,6 +1,10 @@
 package wire
 
+import "github.com/jordanorelli/astro-domu/internal/math"
+
 type Frame struct {
+	RoomName string         `json:"room_name"`
+	RoomSize math.Rect      `json:"room_size"`
 	Entities map[int]Entity `json:"entities"`
 	Players  map[string]int `json:"players"`
 }