Sprouts!
Sprouts!
What do you need? Two (or more) players, a pen, and paper. Start by drawing a few spots on the page. For your first few games, three or four spots are plenty.
What's the goal? Make the final move, leaving your opponent with no viable options.
What are the rules?
On each turn, connect two spots (or connect a spot to itself) with a smooth line, and place a new spot somewhere along the line you just drew.
Just two restrictions: (1) Lines cannot cross themselves or each other, and (2) each spot can have at most three lines sprouting from it.
Eventually, you'll run out of moves. The winner is whoever moves last.
Rules and image from Math Games with Bad Drawings by Ben Orlin.