Three of a Kind - one of the possible 13 poker hands.
You'll need both skill and luck to be a poker ace. Eventually you'll need the units you get from better poker hands or you won't be able to keep up with the damage needed.
The poker interface, where you pick what cards you don't want to keep and discard them for new cards.
Once you're happy with your cards, or you've run out of changes, you hand in your cards for a unit.
Starting screen, with the difficulty vote dialog.