GSlot Casino has cooked up one heck of a bonus package for Canadian players with 20 Free Spins No Deposit on signup (use Bonus Code 'G20') and. GSlot casino deposit bonus has a bonus code for each of the 3 deposits; G, G50 and GS, respectively. Also, the weekly reload bonus uses GS as the bonus code. You will receive your welcome bonus after the first deposit. All Deposit and Withdrawal Options Available for Canadians. Deposits and withdrawals at Gslot are.