King of 7s Slot by Octoplay

King of 7s drops you into a velvet curtain throwroom where OctoPlay leans hard into the number 7 - 7 free spins, +7 extra spins per crown unlock, a x7 global multiplier at peak, and a top symbol paying 77x for five lucky 7s. The 5x3 reels sit on royal-purple drapery patterned with tiny crown wallpaper, and big wins set off cartoon fireworks against the curtain like a coronation party that nobody told the king about.

Base play is deliberately old-school. Five paylines, left-to-right only, low-card symbols 1 through 4 sharing one paytable row, then mid-tier 5, 6, 7 stepping up before the lucky 7 caps the ladder. Wilds appear in two visual flavours but behave the same - they substitute for everything except the Free Spins symbol, and only one Wild can land per active reel on reels 1, 3 and 5. That's it for the base game. No tumbles, no mystery icons, no respins. The whole point of the trigger is reaching the Crown System.

Three locked crowns sit on a bar above the reels during Free Spins, and every Wild that hits unlocks the next one from left to right. First crown locks in a permanent x7 global multiplier on every win for the rest of the round. Second crown turns Wilds into reel-wide expanding ones. Third crown makes those Wilds sticky until the feature ends. Each unlock also tacks +7 spins onto your remaining count, so a fully crowned bonus lasts dramatically longer than the 7 spins you started with. The bonus enters with three Free Spins symbols.

If you don't want to wait for naturally hitting scatters, the Buy Free Spins button charges 60x stake to drop you straight into the round at zero crowns, and the milder Double Chance ante adds 30% to every spin to roughly double trigger frequency. Max win caps at 3,993x - which, doing the math, is essentially a 5-of-a-kind 77x line hit running through the x7 crown multiplier with a few stacked wild reels in support. Modest by 2026 standards, but King of 7s isn't trying to compete with feature-stuffed megaways. It's a stripped-back classic with one good trick, repeated 7 times.