水晶球 Crystal Ball

Crystal Ball is a browser-based action game (HTML5 canvas). You control a small dragon on a solid ground floor under an open arena with only a ceiling above. Enemies are flying: they hover and weave in the air, and shoot at you. You fight back with seven “crystal ball” shots — each key is a different effect, with its own ammo that reloads slowly. Clear the stage for the next of 20 levels; enemy count, HP, and patterns change each stage.

• Score: +200 per enemy KO, plus a level-clear bonus. HUD shows score, HP, lives, level, and ammo.
• Skills: Jump on your own shots to ride them; combine slows, freeze, burn, poison, and heavy hits on flying targets.

Focus the game canvas (click it) so keys register. Holding multiple shot keys only registers the first in this order: Z → X → … → M.

• ← → — Move left / right.
• Space or ↑ — Jump. Works on the ground, on a rising shot, or with feet on a shot’s top surface.
• Enter — After Game Over, press Enter to retry the current level with 5 lives and full HP.

HUD (top of canvas): HP · current/max · Lives · Restart button · Level · Shots line — each letter shows ammo; a dot · means that shot type is still on fire cooldown before you can shoot again.

Seven shots (each costs 1 ammo; ammo regenerates after a delay)

Key	Effect on enemies	Arena (current)
Z	Ice — stops horizontal movement for a short time	— (no mid-level tiles)
X	Fire — hit damage + burn (HP drains over time)	—
C	Water stream — strong slow	—
V	Root — brief full stop (no movement)	—
B	Shrink — smaller hitbox for a few seconds	—
N	Poison — slow HP drain over time	—
M	Heavy — −3 enemy HP in one hit	—

Click the canvas or press any key once if there is no sound (browser autoplay).

• Goal: Defeat every enemy on the stage. A short “level clear” overlay appears; after about one second the next level loads.
• Levels: 20 stages, then loop to level 1. Each level changes enemy count, max HP, and speed using different patterns (swarms, tanks, rush waves, mixed squads, etc.).
• Your HP & lives: You have an HP bar above the dragon and up to 5 lives. Damage: enemy bullet ≈ −1 HP, touching a flying enemy ≈ −2 HP. When HP reaches 0, you lose one life, respawn on the ground with full HP, and get longer invulnerability. Clearing a level does not refill HP or lives. Only Restart or Game Over → Enter resets to 5 lives and full HP.
• Restart: Reloads the current level and resets lives + HP + ammo to defaults.
• Enemy combat: Enemies fly (hover with a gentle bob), have HP, and shoot toward you (faster on higher levels / tougher foes). Your shots cost 1 ammo, deal instant damage (usually 1; M = 3) and apply status effects. +200 per KO.
• Ammo: Each of the seven keys has its own magazine and slow regeneration between shots — plan bursts and use the HUD.
• Stage layout: Ground floor across the bottom, ceiling at the top, open space in between — no middle platforms. Fall far below the screen and you snap back onto the ground.
• Your shots & ceiling: Shots float upward and bounce off walls; they pop at the top of the screen. You can stomp them or bump from below to clear them.
• Riding shots: Land on top of a shot to ride it. Near the top of the screen you are pushed back down so the dragon stays visible.
• Last enemy: When only one enemy remains, it moves faster (“angry”), including its shots.
• Character panel: Right of the game (below on narrow screens) — pick Bub, Bob, Rose, etc. (cosmetic only).

• Conserve ammo: regen is slow — open with control effects (Z C V) then burst damage (M) on big targets.
• Enemy bullets are tinted like their shooter; dodge or use brief invulnerability after a hit to read patterns.
• Pop your own shots with a stomp or bump from below if they block jumps; riding them saves time crossing gaps.
• Level clear adds bonus score (scales with stage number).
• Flying enemies don’t use the floor — aim shots at their height or use wide jumps and ridden shots to reposition.