Grid / Winning System
This slot runs on an 8×8 grid with Cluster Pays mechanics – symbols win when they connect vertically or horizontally anywhere in view. A cluster needs at least 8 matching symbols to pay; the paytable caps rewards at 22+ symbols even if a larger cluster lands. The 4 lower-value symbols (video game, cassette tape, remote control, soda cans) pay 5x stake for 22+. The 4 higher-value symbols (old TV, radio, Game Boy device, pizza) pay 10x stake for the same.
Cascades / Multiplier Positions
When a cluster wins, symbols are removed and new ones drop to fill the gaps. This repeats as long as winning clusters form – cascades can run indefinitely in base game and bonus alike. Every removed cluster leaves behind x2 multipliers in those empty positions. These multipliers double for each subsequent win they touch, stacking up to x2,048 maximum. Catch: only the highest multiplier touching a winning cluster applies to the payout, not a sum or product of all multipliers in play.
At the start of each spin, a 3×3-sized Chemical Spill drops randomly onto the grid, seeding x2 multiplier positions. Wild symbols appear anywhere on any cascade, substituting for pay symbols to complete or boost clusters.
Biohazard Bonus – Tier 1
Land 3 scatters anywhere in view on the same spin or within a cascading sequence to trigger Biohazard. You start with 8 free spins. Landing 3+ scatters during the bonus awards 4 extra spins. Key difference from base game: multiplier positions do not reset between spins – they persist for the entire feature. A Chemical Spill (3×3 multiplier grid) lands once per spin, just like in base play.
Radioactive Bonus – Tier 2
Trigger with 4 scatters in view. This bonus starts with a hold & win pre-stage: you get 3 respins to fill the grid with x2 multiplier positions. Only blanks or x2 multipliers land during respins; each new multiplier resets the counter to 3 again. The hold & win ends when you either fill all positions or land 3 blanks in a row. Once the bonus round proper begins, those accumulated multiplier positions carry over, and you get 8 free spins with non-resetting multipliers and a Chemical Spill per spin.
Contamination Bonus – Tier 3
Land 5 scatters in a single base game round to unlock Contamination. You start with 8 free spins and the grid already packed with x2 multipliers – no hold & win pre-bonus needed. Like the other tiers, multipliers persist across spins and a Chemical Spill lands each spin. This is where multiplier stacking can escalate fastest.
Bonus Buy Menu
| Bonus Round | Cost | Effect |
|---|---|---|
| Biohazard | 100x stake | 8 free spins, non-resetting multipliers |
| Radioactive | 200x stake | Hold & win pre-bonus + 8 free spins, multipliers carry over |
| Contamination | 300x stake | Grid pre-filled with x2 multipliers + 8 free spins |
Bonus Buy is available in certain regions only. A triggering spin follows each purchase, and landing more scatters than the guaranteed minimum is possible.
RTP / Volatility / Hit Frequency
Volatility is high (4/5). Hit Frequency sits at 35.3%, meaning roughly one in three spins lands a winning cluster – not often enough to smooth the ride, but frequent enough to keep cascades ticking over. Bet range £0.10 to £100. Max win 10,000x stake.
Theme / Presentation
Retro monochromatic palette with radioactive green accents. Tetsu the Turtle – an angry sewage-dweller – transforms into a karate master, ninja, or samurai depending on which bonus tier triggers. He rarely smiles except on big wins or bonus entry. The grid is steel-framed, glowing green against dark industrial grime. Symbols echo the 90s: old TVs, cassette tapes, Game Boys, radios, pizza. One of Tetsu’s favorite games visible on his Game Boy is Dead Headz, Jinx Gaming’s own zombie-themed debut. The industrial soundtrack and gritty visual design nail the toxic theme without chasing eye candy – this slot commits to the sludge.
