In this game, Princess Peach learns how to successfully escape from Bowser on her own while Mario and Luigi are on vacation. It's a mix of puzzle, 3D platforming, stealth, etc. The more she escapes, the more confident she gets at it. It'll have 8 episodes, each with 10 levels. The 5th level of each episode features a mini-boss. The 10th level of each episode has a boss and once you defeat it, you get a cutscene of Peach leaving Bowser's Castle and either heading back to her castle, reuniting with Mario and Luigi, or both. So make that game.