The Bottle Opener is a Thing in Paper Mario: Color Splash. It is found within the artillery area in the Golden Coliseum, alongside the Ice Pick. The Shy Guy viewing it states he is unsure of how it is used.
Once the Bottle Opener has been picked up, it is wrung out, refilling Mario's paint and becoming a colorless card. It is kept until it is used in battle, after which it returns to its original position. It can also be purchased from the Wringer for 250 coins. A replica card of the Bottle Opener also exists, and may be collected from the Battle Spin or Prize Pipe Paths. The Bottle Opener may also be placed into the Prisma Museum, where it can be tested.
If and when the Bottle Opener is used in battle, the scenery quickly changes to a modest kitchen, where Mario and the enemies are placed on a large cutting board. The Bottle Opener appears onscreen and lightly taps the first enemy, then "opens" on the enemy. It continues to do so with the other enemies, ending the attack.
Later on in the game, the Bottle Opener must be brought to Redpepper Volcano. Mario must activate Cutout in the room with the red Mini Paint Star and insert the Bottle Opener, initiating a cutscene in which it pops the cap of what appears to be a large stone bottle, unleashing a burst of lava and coins flooding the area. This allows Mario to summon Draggadon in this area, which is essential both for getting the red Mini Paint Star and for rescuing Toad #43 of the red Rescue Squad, hanging onto a nearby stalactite.
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