6 files changed, 98 insertions, 0 deletions
diff --git a/src/engine/levels/Level.ts b/src/engine/levels/Level.ts
new file mode 100644
index 0000000..c5dc23e
--- /dev/null
+++ b/src/engine/levels/Level.ts
@@ -0,0 +1,11 @@
+import { Game } from "..";
+
+export abstract class Level {
+  public readonly name: string;
+
+  constructor(name: string) {
+    this.name = name;
+  }
+
+  abstract init(game: Game): void;
+}
diff --git a/src/engine/levels/LevelNames.ts b/src/engine/levels/LevelNames.ts
new file mode 100644
index 0000000..e90b29a
--- /dev/null
+++ b/src/engine/levels/LevelNames.ts
@@ -0,0 +1,4 @@
+export namespace LevelNames {
+  export const Tutorial = "0";
+  export const LevelSelection = "LevelSelection";
+}
diff --git a/src/engine/levels/LevelSelection.ts b/src/engine/levels/LevelSelection.ts
new file mode 100644
index 0000000..a970d9c
--- /dev/null
+++ b/src/engine/levels/LevelSelection.ts
@@ -0,0 +1,33 @@
+import { LEVELS, Level, LevelNames } from ".";
+import { Game } from "..";
+import { Player, Portal } from "../entities";
+import { Grid, Level as LevelSystem, SystemNames } from "../systems";
+
+export class LevelSelection extends Level {
+  constructor() {
+    super(LevelNames.LevelSelection);
+  }
+
+  public init(game: Game): void {
+    const gridSystem = game.getSystem<Grid>(SystemNames.Grid);
+    const center = gridSystem.getCenterGrid();
+
+    const levelSystem = game.getSystem<LevelSystem>(SystemNames.Level);
+    const unlocked = levelSystem.getUnlockedLevels();
+
+    LEVELS.forEach((level, i) => {
+      if (
+        !unlocked.has(level.name) ||
+        level.name === LevelNames.LevelSelection
+      ) {
+        return;
+      }
+
+      const portal = new Portal(level.name, { x: i, y: 7 });
+      game.addEntity(portal);
+    });
+
+    const player = new Player(center);
+    game.addEntity(player);
+  }
+}
diff --git a/src/engine/levels/Tutorial.ts b/src/engine/levels/Tutorial.ts
new file mode 100644
index 0000000..165b10f
--- /dev/null
+++ b/src/engine/levels/Tutorial.ts
@@ -0,0 +1,32 @@
+import { Level, LevelNames } from ".";
+import { Game } from "..";
+import {
+  Curry,
+  FunctionApplication,
+  LambdaFactory,
+  LockedDoor,
+  Player,
+  Wall,
+} from "../entities";
+
+export class Tutorial extends Level {
+  constructor() {
+    super(LevelNames.Tutorial);
+  }
+
+  public init(game: Game): void {
+    const entities = [
+      new Player({ x: 2, y: 2 }),
+      new Wall({ x: 10, y: 9 }),
+      new Wall({ x: 10, y: 11 }),
+      new Wall({ x: 11, y: 10 }),
+      new Curry({ x: 10, y: 10 }),
+      new LockedDoor({ x: 9, y: 10 }),
+      new LambdaFactory({ x: 6, y: 3 }, "(λ (x) . x)", 3),
+
+      new FunctionApplication({ x: 6, y: 6 }, "(_INPUT key)"),
+    ];
+
+    entities.forEach((entity) => game.addEntity(entity));
+  }
+}
diff --git a/src/engine/levels/index.ts b/src/engine/levels/index.ts
new file mode 100644
index 0000000..36291aa
--- /dev/null
+++ b/src/engine/levels/index.ts
@@ -0,0 +1,12 @@
+export * from "./LevelNames";
+export * from "./Level";
+export * from "./LevelSelection";
+export * from "./Tutorial";
+
+import { LevelNames } from ".";
+import { LevelSelection, Tutorial, Level } from ".";
+
+export const LEVELS: Level[] = [new LevelSelection(), new Tutorial()];
+export const LEVEL_PROGRESSION = {
+  [LevelNames.LevelSelection]: [LevelNames.Tutorial],
+};
diff --git a/src/engine/levels/utils.ts b/src/engine/levels/utils.ts
new file mode 100644
index 0000000..7228f2b
--- /dev/null
+++ b/src/engine/levels/utils.ts
@@ -0,0 +1,6 @@
+import { Entity } from "../entities";
+
+// TODO
+//export const levelFormatToEntityList = (lines: string[]): Entity[] => {
+//
+//}