Eights
Match the suit or the rank on the pile, or play an eight and change the suit to whatever suits you. First to empty their hand wins.
How it works
One person opens kutuverse.com and creates a room. Everyone else joins by scanning the QR code or opening the link — on a phone, a tablet or a laptop, whatever they already have. Nobody makes an account, nobody downloads anything, and the game runs directly between your devices rather than on a company's server.
Short of players? Add computer players to fill the table, or play the whole thing on one device and pass it round.