Biggest Vault

Biggest Vault by Red Tiger Gaming is a slot built around a four-level progression system. The base game introduces Cash Box, Cash Safe, Cash Vault and Bonus Prizes as play advances through Free Spins rounds. Cash symbols carry multipliers from 0.5x to 10x, while Bonus Prizes appear later in the progression with fixed values including Mini, Minor, Major and Grand awards.

The demo version lets players play for free and practice before playing for real money. Free Spins begin when six or more Cash or Bonus Prize symbols land, awarding three spins and adding each new symbol to the reels while resetting the counter. In the later stages, Cash Box collects values already on the screen, Cash Safe converts Royal symbols into cash or prize symbols, and Cash Vault adds Vault Spins with an increasing multiplier.

Bonus Prizes become available only after Level 4 is reached, with the Grand prize limited to one per round. The feature buy options include Cash Collect, Free Spins and Cash Vault, each unlocking a specific bonus state with saved progress restored after the round.