Kero Kero Keroppi no Daibouken 2: Donuts Ike ha Oosawagi! (NES)
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Level Select
At the title screen, hold Select and press Up, Up, Down, Right, and A. A sound will confirm correct code entry. Next, start the game and pause it, then press A or B a number of times to increase or decrease the level. Unpausing jumps you to the level named.