Hero mode: 17 rounds for 500+ GP. This mode gives you the most GP.
......and it doesn't break your guns
or, do playspan, just make an account, do sur.veys till you get 221 UP, exchange it for 20k gp. Then change your ip, change email address, make new account and do it again . Use GMX webmail as you can add alias addresses real fast.
My Brainfuck division algorithm. Input of n7 means 110/55 (ascii values for n and 7):