Stick the dealer
Somebody has to call it
If the bidding goes round twice with nobody taking it on, the deal has to name a suit anyway — a good hand or not. Most of the hands worth talking about afterwards start here.
Four hands and a short deck. You and a computer partner against two more, one card turned up on the table, and two jacks that are no longer where you left them.
One card is turned up, and its suit is on offer to the table in turn. Take it and that's trump; let it go all the way round and anybody can name a different suit instead.
The jack of the trump suit is the best card there is, and the other jack of the same colour is next after it. Whatever that second jack was a moment ago, it belongs to trump now.
Follow the suit that was led if you hold it; the highest card takes the trick. Whichever side named trump needs three of the five, and taking all five is worth two.
Fall short of three and the other side takes two points for the euchre, which is the part everybody remembers. First to ten wins, and then there is another one.
Stick the dealer
If the bidding goes round twice with nobody taking it on, the deal has to name a suit anyway — a good hand or not. Most of the hands worth talking about afterwards start here.
Alone
Put your partner's cards down and play the hand on your own. All five tricks that way is four points, which is why people try it on hands that don't deserve it.
Euchre is free and runs in a browser tab. Nothing to install and nothing to sign into.
Three players are already sitting there, and one of them is on your side. It is the game you'd get at a kitchen table in Ontario, without the part where somebody has to drive home.