Octo Attack Slot Review: Ink Stains and Tenta-Grab

Octo Attack turns the location of a previous win into the setup for a later symbol change. Wins pay first, their symbols disappear, and Ink Stains mark the cleared positions. If Eye of Otto arrives on a grid that still has stains, Tenta-Grab selects one symbol and copies it into every stained position while also replacing the Eye. The feature is about pattern replacement, not simply adding another Wild to the screen.

Play Now

Octo Attack at a glance

Provider	Hacksaw Gaming
Genre / theme	Animals
Game type	Video slot
Main features	Wins leave temporary Ink Stains; Eye of Otto copies one random symbol over them. The free-spin feature preserves stains between spins until Tenta-Grab uses them.

RTP and stake limits can vary by version and market. Check the information screen in the game you open. Maximum win is a ceiling, not an expected result.

A win leaves a map

When a win occurs, it is calculated before the winning symbols are removed and replacements drop into the grid. The vacated winning positions become Ink Stains. Those markers are temporary in the base game: the Tenta-Grab mechanic removes the stains it uses, and they reset between spins. A win can therefore leave a footprint for a follow-up feature during the same spin, but it does not carry that footprint into the next ordinary spin.

Eye of Otto activates only when it lands on a grid containing Ink Stains. It grabs one symbol at random and replaces both itself and every stained position with the grabbed symbol. Eligible targets include low and high symbols, FS symbols, Wilds and Wild Multipliers. If the chosen symbol is a Wild or Wild Multiplier, the replaced positions have a chance to become Wild Multipliers. This is conditional transformation: the Eye needs existing stains, and the chosen target determines what gets copied. The page gives no probability for the possible target or for the chance of multiplier conversion, so neither a high symbol nor a Wild result should be treated as assured.

Wild value and free-spin persistence

Wilds substitute for paytable symbols and can carry additive multiplier values from 1× to 10×. The published page does not explain how multiple Wild multipliers combine on one win, so a specific multiplication formula would be speculation. The safe reading is that both position and symbol type matter: Tenta-Grab can replicate a Wild onto the inked footprint, and that Wild may bring a multiplier value or create a chance of Wild Multipliers in the replaced locations.

Three or more normal FS scatters start Eighth Arm Is the Charm. Its spin count equals the number of triggering scatters, rather than a fixed ten-spin award. In this mode, Ink Stains remain between free spins until Tenta-Grab uses them. That changes the timing window: the feature can carry an unused map forward, allowing a later Eye to act on it. Additional scatters award one extra spin for every three that land together. The page does not state a maximum feature length or an overall maximum win. The difference from base play is thus persistence of the markers, not a guarantee that Eye of Otto will arrive on a useful board.

A focused mechanic with open parameters

Hacksaw’s exact-title page does not list the reel and row count, payout geometry, RTP, volatility, maximum win or exact release date. It also leaves target-symbol odds and multiplier-combination details unspecified. Those gaps matter more here than an advertised top prize would: the core uncertainty is how often a stain is followed by an Eye, and what kind of symbol the Eye copies. The bonus rules explain the sequence but not its frequency.

For readers who enjoy tracking board states, the mechanic is unusually concrete. A win creates the stains; replacements settle; Eye of Otto checks for those stains; one random symbol then fills their positions. The free-spin version holds unused stains across turns, creating a longer interaction between events. Yet all of this depends on the proper symbol arriving before the marks expire or are consumed. Our editor sees a coherent identity in that conditional chain, while the absent probabilities make it difficult to estimate how central the most dramatic multiplier outcome is in actual play.

Strengths and weak points

Strengths

Ink Stains give winning positions a second purpose, and Tenta-Grab’s copy operation creates an easy-to-follow link between a random target and the altered grid.

Weaknesses

The Eye needs stains, targets are random, and multiplier conversion is only a chance. The source omits their odds and Wild-multiplier combination rules.

Our Editor’s View

Octo Attack is built around a compact cause-and-effect chain: a win marks positions, a later Eye of Otto can copy a randomly selected symbol onto those marks, and the free-spin mode preserves unused marks across turns. Our editor likes how the board remembers a win without turning that memory into a guaranteed reward. A Wild target may produce multiplier opportunities, but the page gives no conversion rate or formula for combining multiplier Wilds. That makes Octo Attack easier to describe than to quantify. Players who want a fully specified mathematical profile will need the active game rules, since RTP, volatility and several central probabilities are not published here.