Thunder Mega Sevens Bonus Buy Slot by Evoplay

Bonus symbols land carrying random values of 1x, 2x, 3x, 4x, or 5x total bet. In the base game, filling the grid with 5 or more triggers the Wheel of Thunder directly. During free spins, the mechanic works differently - every Bonus symbol that appears gets its value added to a running total displayed above the reels. After the last free spin, the Wheel of Thunder activates automatically as long as at least one Bonus symbol showed up during the round.

The Wheel of Thunder has seven multiplier sectors (x2, x3, x4, x5, x8, x12) plus two special sectors that combine a multiplier with a respin: x2+Respin and x3+Respin. Landing a respin sector multiplies the accumulated total first, then gives another wheel spin where only pure multiplier sectors remain. That second spin multiplies the already-multiplied total again. The segment sizes on the wheel don't reflect the actual odds.

Free spins start at 10, 15, or 20 depending on whether 3, 4, or 5 scatters land. Retriggers are possible when scatters appear during the feature. Wild substitutes for all regular symbols but only shows up on reels 2 through 5, leaving reel 1 without wild assistance.

Three buy bonus tiers are available: 10 free spins for 50x bet, 15 for 75x, and 20 for 100x. Buying triggers a guaranteed scatter combination on the reels to start the round. More spins mean more chances for Bonus symbols to accumulate before the wheel spin.