Super Mario Galaxy 2 64

Super Mario Galaxy 2 64 is a fan-made Nintendo game.

Plot
Bowser has stolen the Power stars of Peach's Castle ot create a galaxy in the center of the universe (again), so Mario, Luigi, Wario, and Waluigi (playable for the first time) join forces to scour the cosmos for enough power to reach both Bowser and the (once again) kidnapped peach.

After figuring out the remaining star power they have, the gang convert the castle into a starship and pick up some familiar faces (Yoshi, The Toad Brigade, Rosalina, the Baby Luma, and Lubba) to help on their long, long journey....

Mario:
The legendary plumber, surprisingly, is only playable for about (roughly) 71% of the game.

Luigi:
On certain levels, Luigi will step in for his brother and search for the stars himself.

Wario:
When he's not eating garlic by the cloves, Wario can either be found waiting to take on a already-done mission or rustling up stars in certain missions.

Waluigi:
Waluigi will often be searching the cosmos for power stars, so you'll get very little playtime with him.

Donkey Kong:
Mario's old enemy can be played when 120 stars are collected and Bowser is beaten a second time; then the hidden second phase of the boss battle must be beaten; DK is playable then, but only for this half of the fight.

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