Nuts and Bolts

Sort colorful nuts onto matching screws in a satisfying 3D color-sort puzzle. Play 4,800 handcrafted boards across four difficulty tracks, save progress across devices, and use rewarded Hint or Add Screw boosts when a level gets tricky.

Touch or mouse: tap a screw to lift its top nut, then tap an empty screw or one topped with the same color to drop it there; tap the same screw again to put it back. Tap the menu button or the level title to switch difficulty, and use Undo, Hint or Add at the bottom when you get stuck. Keyboard: arrow keys choose a screw and Enter or Space selects it; U undoes, H uses a Hint, A adds a screw, D opens the difficulty list, R restarts the level and F toggles fullscreen.