This is a classic game of tic tac toe. There are two versions of the board: one with a space for magnets and one without a space for magnets. There are 4 peg varieties which allow for with or without magnets and with or without an indent on top to be filled with a color.
The magnets provide a satisfying feeling while placing the pegs, though they are not necessary and were a little difficult to glue in place.
I used these magnets (cheaper if you shop around): https://amzn.to/2JWxb3j
more peg games: https://www.thingiverse.com/thing:2986808
Check out https://www.Vavtech.Etsy.com to see more stuff like this available for purchase.
Pegs should be 100% infill. The game itself should be between 15-30% infill.