Free 2 player games you can play on one screen — lay the phone flat between you for a same-screen duel, or share the keyboard on desktop. Both games below also have a real CPU opponent, so a solo visitor isn't locked out either.
Paddle Clash — a fast neon air-hockey duel
Paddle Clash is a portrait-table air hockey duel, first to 7 goals. True simultaneous multi-touch means both players can strike at once on the same phone — P1 uses WASD on desktop, P2 the arrow keys.
Dots & Boxes 3D — the classic pen-and-paper game, rebuilt in 3D
Dots & Boxes 3D takes the game most people played on paper in school and rebuilds it as a real 3D board with glowing rails and brass pegs. Claim the third side of a box to score it and immediately go again — chains of boxes can swing a game in one turn.
Both games' CPU opponents play real strategy rather than random moves, so solo practice against them is genuinely useful before you challenge a friend. Full list on the Multiplayer category page.