Red hands, also known as hot hands, slapsies, slap jack, red tomato (Northern Britain), slaps, or simply the hand-slap game, is a children's game which can be played by two players.
One player (the "slappee") places their hands palm down, hovering above the other player's (the "slapper") hands. The slapper hovers their hands below the slappee's, palms up. The two players' hands should be barely touching each other, and all the hands should be around mid-torso height.
The slapper is on offense, and attempts to bring his hands over to slap the backsides of his opponent's hands. This must be done with sufficient speed, because the slappee's goal is to pull their hands away, and out of the area where the hands overlap, to avoid the slap. If the slapper misses the hands of the slappee during the slap, then the roles switch. However, the slappee cannot flinch too much.
Another variation is where the slappee has their hands held palms together, held out at mid-torso height; the slapper then does the same with the tips of the fingers of both players hands around a centimetre apart, and then (with just one of their hands) the slapper tries to slap the backs of the slappee's hands. You can slap the slappee's hands with just one of your hands as a strategical move.