Thunder
Thumb

Put your thumb anywhere. The cannon aims at it and fires while your thumb stays down. Don't let anything land on your feed pipe, the glass pipe along the bottom that carries ammo to the cannon. Each hit cracks it and costs a heart. Win a heart back and a crack gets patched. If it breaks, the cannon is done for.

• Blob 10 pts · Zippy fast, 20 pts · Armored 2–3 hits, 30 pts

11 power-ups: shoot to collect, they stack

• Rapid fire
• Spread: 3-way
• Extra cannon (up to 6)
• Pierce: goes through
• Twin lasers
• Homing
• Mega: double damage
• Slow-mo
• Shield: saves a heart
• x2 points
• Bomb: clears the screen

Bullet-hell boss every 5th stage

The boss fills the sky with bullets. Only the glowing core of your cannon can be hit, and bullets heading for it get a red ring: shoot them down, then hit the boss. Near misses score grazes. Beat a boss to save a checkpoint and unlock new themes and cannons (see Collection). Clear all 100 stages to win.