Skull Up

Skull Up is an idle RPG where players summon and upgrade heroes to battle through waves of enemies. Progression is largely passive, allowing for casual, one-handed play. The game features a strong emphasis on competitive play and a significant pay-to-win element, making it best for players who enjoy idle progression and are willing to engage with its monetization.

Themes from 199 recent Google Play reviews, analysed 29 Aug 2026

What each behavioural tag is based on

• Short sessionsRuns are self-contained, so stopping early costs you nothing.
• InterruptiblePut it down mid-session and pick it up cold.
• One-handedPlayable with a thumb, in portrait.
• Needs a connectionOnline-only, so no play on a flight.
• No energy timersNothing caps how long you can play.
• Sound optionalNo audio cue carries information — fine on mute.
• Low focusPlayable while half-distracted.