Jumpasaurs!

Jumpasaurs! is a 5x5 video slot developed by Jinx Gaming, a studio partnered with Hacksaw Gaming. The game was released on March 11, 2026, and marks the second title from Jinx Gaming following their debut release Dead Headz.

The game is built around an 8-bit platformer aesthetic, taking clear inspiration from classic side-scrolling video games. Five pixelated dinosaur characters populate the reels, and the setting shifts between a vibrant prehistoric landscape in the base game and a volcanic, lava-filled environment during the bonus round.

Key features include Activated Reels, Mystery Symbols that can reveal Coins, Wilds, Wild Multipliers, or Scatters, and an Extinction Spins bonus round. The game plays on 19 fixed paylines with a maximum win of 10,000x the bet, reached exclusively during the Extinction Spins feature. The bonus buy option is available for players who want direct access to the feature round.

Jumpasaurs! uses a fully committed 8-bit pixel art style. The base game takes place in a bright, blocky world featuring green landscapes, rolling mountains, waterfalls, mushrooms, and pixel trees. The colour palette is vivid, with strong greens, blues, and yellows dominating the background.

The five dinosaur characters each have a distinct colour, appearing at the bottom of activated reels where they jump to unlock Mystery Symbols. The animations are clean and responsive, fitting the retro platformer theme.

During Extinction Spins, the setting transforms into a darker environment with dead trees, volcanoes, and flowing lava – a clear visual shift that signals the higher-stakes bonus phase.

The audio matches the visual style, with an upbeat chiptune soundtrack during the base game that adds to the nostalgic feel. Sound effects for symbol reveals and wins are consistent with the 8-bit theme throughout.

Jumpasaurs! is played on a 5x5 grid with 19 fixed paylines. Wins are formed by landing matching symbols on adjacent reels from left to right, starting from the leftmost reel.

To adjust your bet, use the arrow controls next to the BET display at the bottom of the screen. Bets range from 0.10 to 100. Press the spin button or use the spacebar to start a round.

Each spin activates between 1 and 3 reels at random, identified by a dinosaur character appearing beneath the reel. Mystery Symbols landing on activated reels are unlocked by the dinosaurs, revealing a hidden prize. The paytable, accessible from the menu, shows all symbol values and feature rules. Autoplay is available with options to set a number of rounds and session loss or win limits.

Activated Reels

On each base game spin, between 1 and 3 reels are randomly activated. An activated reel is marked by one of the five dinosaur characters appearing at its base. Only Mystery Symbols that land on activated reels are unlocked. Mystery Symbols on non-activated reels remain closed and pay nothing.

Mystery Symbols

Mystery Symbols appear as question mark blocks on the reels. When a dinosaur unlocks one on an activated reel, a reveal animation plays, landing on one of the following outcomes:

• Coins – Between 1 and 10 Coins are revealed. Coins come in three tiers: Bronze (1x, 2x, 3x, 5x, or 8x), Silver (10x, 15x, 20x, 25x, or 50x), and Gold (100x). All revealed coin values are added together and paid out as a multiplier of the base bet.
• Wild – Substitutes for all symbols except Mystery Symbols, Coins, and Scatters.
• Wild Multiplier – Functions as a Wild with an attached multiplier of 2x, 3x, 5x, 8x, 10x, 15x, or 20x. When more than one Wild Multiplier contributes to the same win, the multiplier values are added together before being applied.
• Scatter – Reveals the bonus symbol. One Scatter in the base game triggers 8 Extinction Spins.

Only one Mystery Symbol can land per reel per spin.

Extinction Spins

Extinction Spins is the main bonus round, triggered by revealing a single Scatter in the base game. It awards 8 free spins. During Extinction Spins, all five reels are activated on every spin, meaning every Mystery Symbol that lands is guaranteed to be unlocked. All base game mechanics – Coins, Wilds, Wild Multipliers – remain active. If a Mystery Symbol reveals a Scatter during Extinction Spins, 2 additional spins are awarded. The 10,000x maximum win is only achievable within this feature.

Bonus Buy Option: Yes – Cost: 100x the bet (RTP: 96.33%)

Wins are formed by landing 3 or more matching symbols on one of the 19 paylines, from left to right starting on reel 1. The paytable uses bet multipliers, and only the highest win per payline is paid.

Lower-value symbols are classic fruit icons. Higher-value symbols are traditional lucky symbols. The Wild substitutes for all standard pay symbols and pays 150x for five of a kind.

Special Symbols:

• Wild: Substitutes for all standard symbols. Does not substitute for Mystery Symbols, Coins, or Scatters.
• Wild Multiplier: A Wild with a multiplier value of 2x, 3x, 5x, 8x, 10x, 15x, or 20x. Multiple Wild Multiplier values in the same win line are added together.
• Mystery Symbol: A question mark block that is revealed when a dinosaur unlocks it on an activated reel.
• Scatter: Revealed through a Mystery Symbol. One Scatter triggers the Extinction Spins bonus.
• Coins: Revealed through Mystery Symbols. Pay out a combined multiplier value based on tier (Bronze, Silver, or Gold).

Wins are formed across 19 fixed paylines, with matching symbols required on adjacent reels from left to right, starting from reel 1. A minimum of 3 matching symbols is needed.

The core win mechanic in the base game is tied to Mystery Symbol reveals. When a dinosaur activates a reel and unlocks a Mystery Symbol, the result can directly add value through Coins, increase win potential through Wilds and Multipliers, or trigger the bonus via a Scatter.

Wild Multipliers follow an additive rule: if two Wild Multipliers both contribute to the same win, their values are added rather than multiplied together. This caps the multiplier effect but keeps outcomes consistent.

The highest wins are concentrated in the Extinction Spins feature, where all reels are active, Mystery Symbol collection is guaranteed on every spin, and the full multiplier and coin mechanics are in play throughout.

There are no direct variants of Jumpasaurs! at this time. Players who enjoy the 8-bit platformer theme and Mystery Symbol mechanic may also find Jinx Gaming's debut title Dead Headz of interest, which shares the same provider and a similarly distinctive visual style. Within Hacksaw Gaming's broader catalogue, other feature-buy-enabled slots with high volatility profiles offer comparable gameplay structures.

Jumpasaurs! is a high-volatility slot from Jinx Gaming built around a strong 8-bit platformer identity. The Activated Reels and Mystery Symbol system creates a variable base game experience, while Extinction Spins – where all reels are active and every Mystery Symbol is collected – represent the primary path to larger wins, including the 10,000x maximum.

The game suits players who are drawn to bonus-round-focused slots with a clear thematic concept. The base game is deliberately restrained, with only 1 to 3 reels activating per spin. Those who prefer consistent base game action may find this limiting. The bonus buy option at 100x the bet offers a direct route to the feature for players who prefer to skip the base game entirely.