Space Invaders: Infinity Gene

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Hard mode

Defeat the Boss on Level 5-6 (Cleavage) in Normal mode on the Normal difficulty to unlock the Hard difficulty.

Insane mode

Successfully complete Bonus Mode 2 to unlock the Insane difficulty.

Nightmare mode

Successfully complete Challenge mode Stage 99 to unlock the Nightmare difficulty.

Achievements

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

    Classic UFO Hunter (10 points): Eliminate all UFOs in Stage 0.
    High Score Of 10,000,000 (10 points): Acquire a high score of 10,000,000.
    1,500 Chained (10 points): Achieve a chain of 1,500.
    1,000 Nagoya Attacks (10 points): Perform 1,000 Nagoya Attacks in a single stage.
    Music Fan (10 points): Play Music Mode 10 times.
    Easy Difficulty Clear (10 points): Beat Normal Mode on Easy.
    Normal Difficulty Clear (15 points): Beat Normal Mode on Normal.
    Hard Difficulty Clear (20 points): Beat Normal Mode on Hard.
    Insane Difficulty Clear (20 points): Beat Normal Mode on Insane.
    Challenge Mode Clear (20 points): Beat all 99 stages in Challenge Mode.
    Continue-Free Clear (25 points): Beat Normal Mode without using any continues (on any difficulty level with any number of ships).
    Nightmare Difficulty Clear (40 points): Beat Normal Mode on Nightmare.
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