Introducing the sought-after video slot, A Night of Mystery, designed by the experienced gaming provider High 5 Games. Offering a suspense-filled atmosphere and an engaging gaming experience, the key features and mechanics of this game are meticulously listed below:

Game Layout and Structure:
- A Night of Mystery utilizes a 5*3 game grid structure, giving players a detailed and immersive gameplay environment.
- The game offers 40 betways, providing ample opportunities for exciting wins and payouts.

Return to Player (RTP) and Variance:
- The RTP of A Night of Mystery is an impressive 96%, meaning the game pays back this percentage of all bets made over time.
- Carrying a MED-HIGH level variance, the game can potentially deliver significant wins but may also bring phases of dry spells before such payouts.

Features of the Game:

Wild Feature:
- The game includes a Wild feature which can substitute for other symbols to create high-value winning combinations.
- Note that the Wild symbols have their specified rules and circumstances for their activation and utility.

Free Spins Feature:
- A Night of Mystery boasts a Free Spins feature. The activation conditions and number of free spins are determined strictly by the in-game rules.
- The Free Spins feature increases the chances of big wins without the need for the player to spend their own credits.

Bonus Game Feature:
- Moreover, a Bonus Game feature is also included. This feature leads the players into an exceptional mini-game where they have a higher chance of winning bonus credits or prizes.
- The Bonus Game triggers under certain conditions within the main game.

Substitution Symbols Feature:
- A Night of Mystery video slot also presents a unique feature, Substitution Symbols. These can replace any other symbol on the reels to form winning combinations and enhance the player's chances of getting a payout.
- Each Substitution Symbol has particular circumstances for its activation and functionality.

Bonus Symbols:
- Lastly, the game includes Bonus Symbols. These symbols can activate bonus rounds or multiply payouts depending on the conditions outlined in the game rules.
- Each Bonus Symbol's attributes and uses are explained in the game's paytable.