Normally you have a board with pegs for each player, and rounds have you move your pegs up a number of holes for your score. First to 121 wins. Increments are a

Normally you have a board with pegs for each player, and rounds have you move your pegs up a number of holes for your score. First to 121 wins. Increments are anywhere from nothing to 29 (excluding 19, 25-27). Personally I'd just make a few differently sized sticks/rocks to represent 5s, 1s, and 30s. Maybe 2s since those are common. Maybe -1s as well, and consolidate if I want during shuffling/dealing. (30s being convenient because if you lose by multiples of 30 it counts as a skunk / an extra loss.) (Edit: Actually I might just make a board in the dirt with sticks to designate every 5 points, like a real board, and each player just puts down 1-5 rocks in the segment they are in. But that gets dangerously close to just finding 120 small rocks... On the plus side, that's almost enough rocks for one side in a game of Go.)