Crazy Hand (クレイジーハンド) is Master Hand's left hand counterpart introduced in Super Smash Bros. Melee. While Master Hand's movements are very mature and easygoing, Crazy Hand moves in dysfunctional and erratic ways. Crazy Hand looks exactly the same as Master Hand (apart from being a left hand), but he is more erratic and chaotic in general. He is impulsive, destructive, and consumed with a hollow feeling which comes from destroying one’s own creations.
In Super Smash Flash, Crazy Hand appears exclusively as the final boss of Adventure mode alongside Master Hand. Like Master Hand, Crazy Hand cannot be defeated by normal means; instead of damage, he has "hit points" (HP), the amount of which is altered based on the difficulty (for example, he only has 150 HP when fought on Very Easy mode) and must be depleted. Once 0 HP is reached for both bosses, they explode into the background and the mode is beaten. To fight him, the player must to clear this mode on any difficulty and deplete Master Hand's (HP) to the halfway point, and then Crazy Hand will appear to aid Master Hand. The player must then proceed to defeat both bosses.
Unlike the original Super Smash Bros. games, both Hands don't use conjunction attacks with each other, such as claps or double punches, and attack exactly the same, only that Crazy Hand is a bit faster than Master Hand.
In Super Smash Flash 2
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Crazy Hand appears in the Game Boy Advance game Kirby & The Amazing Mirror (the game the Super Smash Flash Hands sprites were ripped from) alongside Master Hand, as the boss of Candy Constellation. However, the concept of the Hands may have come from a boss called Wham Bam Rock from Kirby Super Star and Kirby Super Star Ultra (the game's remake), who attacked Kirby with a stone hand that used different slaps, pokes, and grabs. In Kirby Super Star Ultra, a crystalline version called Wham Bam Jewel appears, with more parallels to the two hands.