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Waku Waku Monster (わくわくモンスター) is a falling-block puzzle game for the Sega Saturn.
According to an unused message found in the game's files, the game was originally developed as an arcade game. However, the arcade release was cancelled, because during a one-day location test, the game earned only a few yen. If the message "SEX" is entered at the name entry screen, it will be changed to "TTC". TTC stands for Tokyo Technical College, which is the programmer's alma mater.