Jammin' Jars and Razor Shark are Push Gaming's two most-played UK titles. Push has built a reputation for distinctive mechanical design and competitive RTPs across its catalogue, and these two slots represent the studio's commercial peak. Jammin' Jars publishes a theoretical RTP of 96.83% — among the highest in the entire Push catalogue. Razor Shark publishes 96.70% — also strong by mainstream slot standards but 0.13 percentage points below Jammin' Jars. At identical deployment tiers, Jammin' Jars is the better mathematical proposition.
The 0.13pp gap
Over £10,000 of wagering volume, a 0.13pp RTP difference represents £13 of expected return. Small, but real. Push Gaming uses a tier-based deployment system, and at every tier the gap between these two titles holds in Jammin' Jars' favour. There is no scenario where Razor Shark becomes the mathematically superior choice unless your casino specifically deploys it at a higher tier than Jammin' Jars — an unusual configuration but worth verifying in the in-game RTP information panel before committing extended sessions.
Mechanical differences shape the experience
Razor Shark uses a mystery-stack mechanic combined with a Razor Reveal feature. Mystery symbols stack on the reels and reveal as a single matched symbol when the spin completes — typically high-value symbols when stacks fully reveal. The free spins round adds a multiplier that increases each time a Nudge wild lands, building tension across the round and producing escalating payouts in extended bonus sessions. The visual presentation is restrained and the gameplay rhythm involves longer tension-and-release cycles — many quiet spins followed by dramatic reveals.
Jammin' Jars uses cluster pays on an 8x8 grid with tumbling wins. The defining feature is the multiplier jar wild — a special symbol that begins with a 1x multiplier, moves to a random new position each cascade, and increases its multiplier by 1x with every move during the free spins round. Multiple jars on the grid simultaneously stack their multipliers. Late-stage free-spins cascades with multiple high-multiplier jars produce the game's largest payouts. The visual presentation is bright and chaotic, and the rhythm involves frequent visual events with moments of cascading explosion.
Volatility profiles
Both are categorised as high volatility, but the underlying distributions differ in shape. Razor Shark concentrates returns into the bonus round multiplier mechanic — base-game variance is moderate, with most extreme outcomes living in extended free-spins sequences. Jammin' Jars distributes variance more evenly across base game and bonus, with the cluster-tumble mechanic producing more frequent visual wins of varying size. Players seeking longer, more contemplative sessions often prefer Razor Shark's pacing. Players seeking constant visual feedback and dramatic cascade events often prefer Jammin' Jars.
Tier deployment
Both titles run on Push Gaming's tier system. UK operator deployment varies — most major casinos run Push titles at the top or near-top tier, but several mid-market operators deploy lower. Verifying the deployed figure at your casino is essential before treating the published comparison as decisive. The 0.13pp headline gap is small enough that a single tier-step difference between the two titles at your casino could reverse the practical outcome entirely.
Verdict
At identical deployment tiers, Jammin' Jars is the better mathematical choice by 0.13pp. The mechanical experiences are genuinely different — Razor Shark for the mystery-stack tension model, Jammin' Jars for the multiplier-jar cluster-cascade model. Both are top-tier choices within the high-volatility category. For broader context on the studio, see our Push Gaming provider page.