Space or ↑ — Jump. Works on the ground, while standing on a bubble, or when your feet are on a bubble top.
Z — Shoot a bubble (short cooldown). Bubbles drift, then rise; they bounce off the left and right edges.
Click the game canvas or press a key once if Web Audio has no sound (browser autoplay rules).
←→ — 左右移動。
空白鍵 或 ↑ — 跳躍；可在地面、站在泡泡上、或腳踩在泡泡頂時使用。
Z — 吐泡（有冷卻）；泡泡會飄移後上升，並在左右邊界反彈。
若無音效，請點一下遊戲畫布或按任意鍵（瀏覽器自動播放限制）。
How to play · 玩法
Goal: Defeat every enemy on the stage. When the last free enemy is gone, a short congratulations screen appears; after about one second the next level loads automatically.
Levels: 20 stages. After clearing level 20, the game loops back to level 1.
Lives: Each level starts with 5 lives. Touching a free (non-trapped) enemy costs one life; you respawn with brief invulnerability. At 0 lives, choose Enter to retry the current level with 5 lives.
Restart (HUD button) reloads the current level.
Bubbles: Catch enemies inside a bubble. Touch that bubble to pop it and score (+200). If you wait 5 seconds, the bubble breaks and the enemy escapes, angry and faster.
Ceiling: Bubbles break when they hit the top. Empty bubbles pop; trapped enemies are released (same as timeout).
Riding: You can stand on a rising bubble and move with it. Jump off anytime. Near the ceiling you are pushed down so the character stays on screen.
Last enemy: When only one free enemy remains, it becomes faster (“angry”).
Character panel: Pick a color scheme (Bub, Bob, etc.) on the right of the canvas; on small screens it sits below the game.
目標： 清空畫面上所有敵人。最後一名自由敵人消失後會顯示恭喜畫面，約 1 秒後自動進入下一關。
關卡： 共 20 關；全破後會從第 1 關再玩。
生命： 每關開始 5 條命。碰到未入泡的敵人扣一命並短暫無敵後重生。生命歸零時按 Enter 以 5 命重打本關。