Or if you need another antique example: opentnl, the network library use in a 2001 released game Tribes 2 had „client puzzles“ (aka PoW): https://github.com/koc

Or if you need another antique example: opentnl, the network library use in a 2001 released game Tribes 2 had „client puzzles“ (aka PoW): https://github.com/kocubinski/opentnl/blob/master/tnl/clientPuzzle.cpp https://github.com/kocubinski/opentnl/blob/master/tnl/client...