Gama Casino offers existing players a deposit bonus of up to 99. The minimum deposit to qualify is 500 ₽.
The bonus code is DEVZ. Slots are the only games that count toward this offer. The bonus carries a wagering requirement (which applies before any withdrawal).
The code has to be entered when making the deposit. The bonus is aimed at players who already hold an account at Gama Casino, not at new registrations.
Slot players get the most use from it, since other game types don't count. Check the bonus terms in the cashier before depositing; that way the wagering conditions and the 500 ₽ minimum are clear before any money leaves the account.