Secret of Mana + anything Mario = Secret of Mario! (Mario is the hero, Toad is the Sprite child, Peach is the princess heroine, Yoshi is Neko-chan, Bob-ombs are the cannon travel keepers..)
Tetris + anything Mario = Toad-tris (different colored Mushroom blocks make up the Tetrads, and the game has a Mario game theme, similar to the different themes of Tetris DS). Tetris DS needed more Kirby love.