Multiplier Wilds:

The Multiplier Wilds are Wild symbols.

Multiplier Wilds can appear on anywhere on reels 1-5 and substitute for all other symbols, except Scatter symbols and Nitro symbols.

The Multiplier Wilds have the same multiplier as the reels that they land on (1x-5x).

If 2 or more Multiplier Wilds appear on a winning bet line, then the corresponding multipliers are multiplied.

Free Spins:

In the main game only, 3 Scatter symbols appearing anywhere on reels 2, 3 and 4 activate 10 free spins.

In free spins only, 3 Nitro symbols appearing anywhere on reels 2, 3 and 4 award additional free spins and overlay Multiplier Wilds.

The overlay Multiplier Wild symbols randomly appear anywhere on the reels and act as a Multiplier Wild symbol.

Only one overlay Multiplier Wild symbol can appear on a reel.

Nitro Collect Meter:

Collected Nitro symbols are stacked in the Nitro Collect Meter from bottom to top.

If a Nitro symbol appears above an overlay Multiplier Wild, it is counted as both a Nitro symbol and a Multiplier Wild symbol. 

The free spins start with the player racing against Twitch, the first opponent.

After collection 3 Nitro symbols, the game moves to the next level. The player wins a random overlay Wild Multiplier symbol and the next racing opponent appears. When reaching a new level, the player is awarded additional free spins.

Each new free spin round starts with an empty Nitro Collect Meter.

If a player collects 2 Nitro symbols in one spin, and 3 Nitro symbols in the next spin, the 2 Nitro symbols remaining are counted and carried forward to the next round.

After collection 3 Nitro symbols against Bruiser, the final opponent, the player races until the end of the free spins.