Card games
Against an opponent that does the arithmetic. Free, offline-capable, and it never asks who you are.
Cribbage121 up, pegging and the show — and it shows you the count.
HeartsDuck the queen, dodge the points — or take every one and shoot the moon.
EuchreBowers, bidding, going alone — with a partner that can actually play.
SpadesBid your tricks. Beware the bags. Nil is worth a hundred — or costs one.
Solitaire →Seven games for one player.