5 files changed, 67 insertions, 0 deletions
diff --git a/src/engine/systems/Collision.ts b/src/engine/systems/Collision.ts
index 7d843cc..0bc6f5c 100644
--- a/src/engine/systems/Collision.ts
+++ b/src/engine/systems/Collision.ts
@@ -7,6 +7,7 @@ const collisionMap: Record<string, Set<string>> = {
   [EntityNames.Key]: new Set([EntityNames.LockedDoor]),
   [EntityNames.Curry]: new Set([EntityNames.Player]),
   [EntityNames.FunctionApplication]: new Set([EntityNames.FunctionBox]),
+  [EntityNames.Portal]: new Set([EntityNames.Player]),
 };
 
 export class Collision extends System {
diff --git a/src/engine/systems/Grid.ts b/src/engine/systems/Grid.ts
index 1ec8ed9..c504bfe 100644
--- a/src/engine/systems/Grid.ts
+++ b/src/engine/systems/Grid.ts
@@ -377,4 +377,11 @@ export class Grid extends System {
       this.grid[y][x].add(id);
     });
   }
+
+  public getCenterGrid() {
+    return {
+      x: Math.floor(this.grid[0].length / 2),
+      y: Math.floor(this.grid.length / 2),
+    };
+  }
 }
diff --git a/src/engine/systems/Level.ts b/src/engine/systems/Level.ts
new file mode 100644
index 0000000..87e12a5
--- /dev/null
+++ b/src/engine/systems/Level.ts
@@ -0,0 +1,57 @@
+import { SystemNames, System } from ".";
+import { Game } from "..";
+import { type Level as LevelType, LEVELS, LEVEL_PROGRESSION } from "../levels";
+
+export class Level extends System {
+  private unlockedLevels: Set<string>;
+  private currentLevel: LevelType | null;
+  private moveToLevel: string | null;
+  private levelMap: Map<string, LevelType>;
+
+  constructor(initialLevel: string) {
+    super(SystemNames.Level);
+
+    this.levelMap = new Map();
+    LEVELS.forEach((level) => {
+      this.levelMap.set(level.name, level);
+    });
+
+    this.currentLevel = null;
+    this.moveToLevel = initialLevel;
+    this.unlockedLevels = new Set();
+  }
+
+  public setLevel(level: string) {
+    this.moveToLevel = level;
+  }
+
+  public update(_dt: number, game: Game) {
+    if (this.moveToLevel === this.currentLevel?.name || !this.moveToLevel) {
+      return;
+    }
+
+    if (this.currentLevel) {
+      game.resetState();
+    }
+
+    const unlockedLevels = LEVEL_PROGRESSION[this.moveToLevel];
+    if (unlockedLevels && unlockedLevels.length > 0) {
+      unlockedLevels.forEach((levelName) => {
+        if (!this.unlockedLevels.has(levelName)) {
+          this.unlockedLevels.add(levelName);
+        }
+      });
+    }
+
+    if (!this.unlockedLevels.has(this.moveToLevel)) {
+      this.unlockedLevels.add(this.moveToLevel);
+    }
+    this.currentLevel = this.levelMap.get(this.moveToLevel)!;
+    this.currentLevel.init(game);
+    this.moveToLevel = null;
+  }
+
+  public getUnlockedLevels() {
+    return this.unlockedLevels;
+  }
+}
diff --git a/src/engine/systems/SystemNames.ts b/src/engine/systems/SystemNames.ts
index 363c72c..63f83a4 100644
--- a/src/engine/systems/SystemNames.ts
+++ b/src/engine/systems/SystemNames.ts
@@ -7,4 +7,5 @@ export namespace SystemNames {
   export const Collision = "Collision";
   export const Life = "Life";
   export const Music = "Music";
+  export const Level = "Level";
 }
diff --git a/src/engine/systems/index.ts b/src/engine/systems/index.ts
index 46c534d..29dbc7e 100644
--- a/src/engine/systems/index.ts
+++ b/src/engine/systems/index.ts
@@ -8,3 +8,4 @@ export * from "./GridSpawner";
 export * from "./Collision";
 export * from "./Life";
 export * from "./Music";
+export * from "./Level";