Activate a speed upgrade during a run.

Activate a missle upgrade during a run.

Activate a double upgrade during a run.

Activate a laser upgrade during a run.

Activate an option upgrade during a run.

Activate a shield upgrade during a run.

Activate the max number of speed upgrades during a run.

Activate the max number of option upgrades during a run. But watch out for the Option Hunter, which was introduced in II.

Earn an extra life during a run.

Earn a second extra life during a run. The threshold for earning the second extra life was raised from 70K to 150K to urgently patch an exploit to milk infinitely.

Clear stage one. This game has no continues.

Clear stage two.

Clear stage three.

Clear stage four.

Beat the mid-boss of stage five.

Clear stage five.

Clear stage six.

Clear the boss rush of stage seven. The boss rush was introduced in II.

Clear stage seven.

Beat the wall mid-boss in stage eight. Safe spot OK.

Dev challenge: beat the wall mid-boss in stage eight without: staying still for more than two seconds at a time. In other words, safe spot prohibited.

Make it past the crab Boss in stage eight. This boss was introduced in II.

Beat the game using Weapon Type A. Constitutes a one-credit clear (1CC) of the game. Weapon types were introduced in II.

Beat the game using Weapon Type B. Constitutes a one-credit clear (1CC) of the game.

Beat the game using Weapon Type C. Constitutes a one-credit clear (1CC) of the game.

Beat the game using Weapon Type D. Constitutes a one-credit clear (1CC) of the game.

Beat the game after having selected Shield type. Constitutes a one-credit clear (1CC) of the game.

Beat the game after having selected Force-Field type. Constitutes a one-credit clear (1CC) of the game. The Force Field was introduced in II.

Dev challenge: beat the game without activating any shield or force field. Constitutes a one-credit clear (1CC) of the game.

Clear stage one on the second loop.

Clear stage two on the second loop.

Clear stage three on the second loop.

Clear stage four on the second loop. The stage is now filled with volcanoes!

Dev challenge: score 50K points in a run.

Dev challenge: score 100K points in a run.

Dev challenge: score 200K points in a run.

Dev challenge: score 300K points in a run.

Dev challenge: score 400K points in a run.

Dev challenge: recover and clear stage one after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage two after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage three after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage four after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage five after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage six after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage seven after taking a death in the middle of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: recover and clear stage eight after taking a death in the middle of the second half of the stage. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Dev challenge: clear stage one at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage two at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage three at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage four at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage five at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage six at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage seven at loop one's max rank of 16. No specific loop requirement. A challenge indicator will appear if your rank qualifies.

Dev challenge: clear stage eight at loop one's max rank of 16. No specific loop requirement. Can't use safe spots. A challenge indicator will appear if your rank qualifies.

Dev challenge: recover and beat the mid-boss after taking a death in the middle of the first half of stage eight. Safe spot OK. A frame counter will appear when you've reached this middle area. Take a death there to make a challenge indicator appear.

Make it past the high-speed section of stage six. High-speed sections were introduced in II.