Developer 
Lines 
RTP Coins Sniffer Hold And Win by 1spin4win is a high-volatility online slot with 27 paylines and a bet range from 0.01 to 50. The game uses a coin and treasure theme, with graffiti-style streets, a dog character, and symbols including a lantern, a drink can, and a money bag Wild that substitutes for all symbols except Coins.
The main feature is the Hold and Win bonus. Landing 3 or more Coins, or using the Buy Bonus option, triggers 3 respins. Each new Coin locks in place and resets the respin count to 3. Special Coin symbols can also award jackpot-style prizes, with a Mini Jackpot Coin linked to a Minipot x100 and collecting all 9 Coins linked to a Megapot x1,000.
This page offers the demo version, so players can play for free and practice before playing for real money. The game information lists an RTP of 97.1%, with 9 special letters in the main game doubling rewards.
