diff --git a/01_the_screen/data.go b/01_the_screen/data.go
new file mode 100644
index 0000000..af891ee
--- /dev/null
+++ b/01_the_screen/data.go
@@ -0,0 +1,38 @@
+package main
+
+import (
+  "github.com/gdamore/tcell/v2"
+)
+
+const (
+  WALL = '#'
+  SPACE = '.'
+  PATH_LIMIT = 1000
+  RENDER = true
+  SHOW_RENDER = false
+  SHOW_PATHS = false
+  HEARING_DISTANCE = 6
+)
+
+type Map [][]rune
+
+type Position struct {
+  X int
+  Y int
+}
+
+type Enemy struct {
+  HP int
+  Pos Position
+  Damage int
+}
+
+type Game struct {
+  Screen tcell.Screen
+  Level Map
+  Player Enemy
+  Status string
+  Width int
+  Height int
+  Enemies map[Position]*Enemy
+}
diff --git a/01_the_screen/debug.go b/01_the_screen/debug.go
new file mode 100644
index 0000000..24e929f
--- /dev/null
+++ b/01_the_screen/debug.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+  "log"
+  "os"
+)
+
+var dbg *log.Logger
+
+func DebugInit() {
+  out, err := os.Create("debug.log")
+  if err != nil { log.Fatal(err) }
+  dbg = log.New(out, "", log.LstdFlags)
+}
diff --git a/01_the_screen/game.go b/01_the_screen/game.go
new file mode 100644
index 0000000..403d758
--- /dev/null
+++ b/01_the_screen/game.go
@@ -0,0 +1,27 @@
+package main
+
+import (
+  "os"
+)
+
+func NewGame(width int, height int) (*Game) {
+  var game Game
+
+  game.Width = width
+  game.Height = height
+  game.Enemies = make(map[Position]*Enemy)
+
+  game.Level = make(Map, height, height)
+
+  game.Player = Enemy{20, Position{1,1}, 4}
+
+  return &game
+}
+
+func (game *Game) Exit() {
+  if RENDER {
+    game.Screen.Fini()
+  }
+
+  os.Exit(0)
+}
diff --git a/01_the_screen/main.go b/01_the_screen/main.go
index c823cdd..0a9a365 100644
--- a/01_the_screen/main.go
+++ b/01_the_screen/main.go
@@ -1,199 +1,10 @@
-
 package main
 
-import (
-  "os"
-  "log"
-  "fmt"
-  "github.com/gdamore/tcell/v2"
-  "github.com/gdamore/tcell/v2/encoding"
-)
-
-var dbg *log.Logger
-
-const (
-  WALL = '#'
-  SPACE = '.'
-  RENDER = true
-)
-
-type Map [][]rune
-type Paths [][]int
-
-type Position struct {
-  x int
-  y int
-}
-
-type Enemy struct {
-  hp int
-  pos Position
-  damage int
-}
-
-type Game struct {
-  screen tcell.Screen
-  level Map
-  player Enemy
-  status string
-  width int
-  height int
-}
-
-func (game *Game) DrawText(x int, y int, text string) {
-  for i, cell := range text {
-    game.screen.SetContent(x+i, y, cell, nil, tcell.StyleDefault)
-  }
-}
-
-func (game *Game) DrawStatus() {
-  game.DrawText(0, game.height, game.status)
-
-  hp := fmt.Sprintf("HP: %d", game.player.hp)
-
-  game.DrawText(game.width - len(hp), game.height, hp)
-}
-
-func (game *Game) Status(msg string) {
-  game.status = msg
-}
-
-func (game *Game) DrawEntity(symbol rune, pos Position, color tcell.Color) {
-  style := tcell.StyleDefault.Bold(true).Foreground(color)
-  game.screen.SetContent(pos.x, pos.y, symbol, nil, style)
-}
-
-func (game *Game) DrawMap() {
-  gray := tcell.StyleDefault.Foreground(tcell.ColorGray)
-
-  for y, line := range game.level {
-    for x, cell := range line {
-      if cell == SPACE {
-        game.screen.SetContent(x, y, cell, nil, gray)
-      } else {
-        game.screen.SetContent(x, y, cell, nil, tcell.StyleDefault)
-      }
-    }
-  }
-}
-
-func (game *Game) Render() {
-  if !RENDER { return }
-
-  game.screen.Clear()
-
-  game.DrawMap()
-
-  game.DrawEntity('@', game.player.pos, tcell.ColorYellow)
-
-  game.DrawStatus()
-
-  game.screen.Show()
-}
-
-func (game *Game) Exit() {
-  if RENDER {
-    game.screen.Fini()
-  }
-
-  os.Exit(0)
-}
-
-func (game *Game) Occupied(x int, y int) bool {
-  return game.level[y][x] != SPACE
-}
-
-func (game *Game) NewMap() {
-  game.level = Map{
-    []rune("#################"),
-    []rune("#.#...#.........#"),
-    []rune("#.#.###.#.###.#.#"),
-    []rune("#.#.....#...#.#.#"),
-    []rune("#.#.#######.#.###"),
-    []rune("#.#...#...#.#...#"),
-    []rune("#.###.###...###.#"),
-    []rune("#...#.......#...#"),
-    []rune("#.#.#########...#"),
-    []rune("#.#.............#"),
-    []rune("#################"),
-  }
-}
-
-func (game *Game) MovePlayer(x_delta int, y_delta int) {
-  target := Position{
-    game.player.pos.x + x_delta,
-    game.player.pos.y + y_delta,
-  }
-
-  if !game.Occupied(target.x, target.y) {
-    game.player.pos = target
-  }
-}
-
-func (game *Game) HandleKeys(ev *tcell.EventKey) bool {
-  switch ev.Key() {
-  case tcell.KeyEscape:
-    return false
-  case tcell.KeyUp:
-    game.MovePlayer(0, -1)
-  case tcell.KeyDown:
-    game.MovePlayer(0, 1)
-  case tcell.KeyRight:
-    game.MovePlayer(1, 0)
-  case tcell.KeyLeft:
-    game.MovePlayer(-1, 0)
-  }
-
-  switch ev.Rune() {
-  case 'q':
-    return false
-  }
-
-  return true
-}
-
-func (game *Game) HandleEvents() bool {
-  if !RENDER { return false }
-
-  switch ev := game.screen.PollEvent().(type) {
-  case *tcell.EventResize:
-    game.screen.Sync()
-  case *tcell.EventKey:
-    return game.HandleKeys(ev)
-  }
-
-  return true
-}
-
-func (game *Game) InitScreen() {
-  encoding.Register()
-
-  var err error
-  game.screen, err = tcell.NewScreen()
-  if err != nil { log.Fatal(err) }
-
-  err = game.screen.Init()
-  if err != nil { log.Fatal(err) }
-}
-
-func NewGame(width int, height int) (*Game) {
-  var game Game
-
-  game.width = width
-  game.height = height
-  game.level = make(Map, height, height)
-  game.player = Enemy{20, Position{1,1}, 4}
-
-  return &game
-}
-
 func main() {
-  out, err := os.Create("debug.log")
-  if err != nil { log.Fatal(err) }
-  dbg = log.New(out, "", log.LstdFlags)
+  DebugInit()
 
   game := NewGame(17, 11)
-  err := game.InitScreen()
+  game.InitScreen()
 
   game.NewMap()
   game.Render()
diff --git a/01_the_screen/map.go b/01_the_screen/map.go
new file mode 100644
index 0000000..f79fd25
--- /dev/null
+++ b/01_the_screen/map.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+  "slices"
+)
+
+func compass(near Position, offset int) []Position {
+  return []Position{
+    Position{near.X, near.Y - offset},
+    Position{near.X, near.Y + offset},
+    Position{near.X + offset, near.Y},
+    Position{near.X - offset, near.Y},
+  }
+}
+
+func (game *Game) CloneMap() Map {
+  // this is a shallow copy though
+  new_map := slices.Clone(game.Level)
+
+  for i, row := range new_map {
+    // this makes sure the row is an actual copy
+    new_map[i] = slices.Clone(row)
+  }
+
+  return new_map
+}
+
+func (game *Game) Inbounds(pos Position, offset int) bool {
+  return pos.X >= offset &&
+    pos.X < game.Width - offset &&
+    pos.Y >= offset &&
+    pos.Y < game.Height - offset
+}
+
+func (game *Game) Occupied(pos Position) bool {
+  is_player := pos == game.Player.Pos
+
+  // Inbounds comes first to prevent accessing level with bad x,y
+  return !game.Inbounds(pos, 1) ||
+      game.Level[pos.Y][pos.X] == WALL ||
+      is_player
+}
+
+func (game *Game) FillMap(target Map, setting rune) {
+  for y := 0 ; y < game.Height; y++ {
+    target[y] = slices.Repeat([]rune{setting}, game.Width)
+  }
+}
+
+
+func (game *Game) NewMap() {
+  game.Level = Map{
+    []rune("#################"),
+    []rune("#.#...#.........#"),
+    []rune("#.#.###.#.###.#.#"),
+    []rune("#.#.....#...#.#.#"),
+    []rune("#.#.#######.#.###"),
+    []rune("#.#...#...#.#...#"),
+    []rune("#.###.###...###.#"),
+    []rune("#...#.......#...#"),
+    []rune("#.#.#########...#"),
+    []rune("#.#.............#"),
+    []rune("#################"),
+  }
+}
diff --git a/01_the_screen/movement.go b/01_the_screen/movement.go
new file mode 100644
index 0000000..3fee1d0
--- /dev/null
+++ b/01_the_screen/movement.go
@@ -0,0 +1,12 @@
+package main
+
+func (game *Game) MovePlayer(x_delta int, y_delta int) {
+  target := Position{
+    game.Player.Pos.X + x_delta,
+    game.Player.Pos.Y + y_delta,
+  }
+
+  if !game.Occupied(target) {
+    game.Player.Pos = target
+  }
+}
diff --git a/01_the_screen/ui.go b/01_the_screen/ui.go
new file mode 100644
index 0000000..198ccb5
--- /dev/null
+++ b/01_the_screen/ui.go
@@ -0,0 +1,114 @@
+package main
+
+import (
+  "log"
+  "fmt"
+  "github.com/gdamore/tcell/v2"
+  "github.com/gdamore/tcell/v2/encoding"
+)
+
+//// DRAWING
+
+func (game *Game) DrawText(x int, y int, text string) {
+  for i, cell := range text {
+    game.Screen.SetContent(x+i, y, cell, nil, tcell.StyleDefault)
+  }
+}
+
+func (game *Game) DrawStatus() {
+  game.DrawText(0, game.Height, game.Status)
+
+  hp := fmt.Sprintf("HP: %d", game.Player.HP)
+
+  game.DrawText(game.Width - len(hp), game.Height, hp)
+}
+
+func (game *Game) SetStatus(msg string) {
+  game.Status = msg
+}
+
+func (game *Game) DrawEntity(symbol rune, pos Position, color tcell.Color) {
+  style := tcell.StyleDefault.Bold(true).Foreground(color)
+  game.Screen.SetContent(pos.X, pos.Y, symbol, nil, style)
+}
+
+func (game *Game) DrawMap() {
+  gray := tcell.StyleDefault.Foreground(tcell.ColorGray)
+
+  for y, line := range game.Level {
+    for x, cell := range line {
+      if cell == SPACE {
+        game.Screen.SetContent(x, y, cell, nil, gray)
+      } else {
+        game.Screen.SetContent(x, y, cell, nil, tcell.StyleDefault)
+      }
+    }
+  }
+}
+
+///// RENDERING
+
+func (game *Game) InitScreen() {
+  var err error
+  encoding.Register()
+
+  game.Screen, err = tcell.NewScreen()
+
+  // using log.Fatal instead of dbg.Fatal
+  // because the screen isn't setup yet
+  if err != nil { log.Fatal(err) }
+
+  err = game.Screen.Init()
+  if err != nil { log.Fatal(err) }
+}
+
+func (game *Game) Render() {
+  if !RENDER { return }
+
+  game.Screen.Clear()
+
+  game.DrawMap()
+
+  game.DrawEntity('@', game.Player.Pos, tcell.ColorYellow)
+
+  game.DrawStatus()
+
+  game.Screen.Show()
+}
+
+//// EVENTS
+
+func (game *Game) HandleKeys(ev *tcell.EventKey) bool {
+  switch ev.Key() {
+  case tcell.KeyEscape:
+    return false
+  case tcell.KeyUp:
+    game.MovePlayer(0, -1)
+  case tcell.KeyDown:
+    game.MovePlayer(0, 1)
+  case tcell.KeyRight:
+    game.MovePlayer(1, 0)
+  case tcell.KeyLeft:
+    game.MovePlayer(-1, 0)
+  }
+
+  switch ev.Rune() {
+  case 'q':
+    return false
+  }
+
+  return true
+}
+
+func (game *Game) HandleEvents() bool {
+  if !RENDER { return false }
+
+  switch ev := game.Screen.PollEvent().(type) {
+  case *tcell.EventResize:
+    game.Screen.Sync()
+  case *tcell.EventKey:
+    return game.HandleKeys(ev)
+  }
+
+  return true
+}