Skull Up

Fan-made community wiki

This idle RPG is Efun's undead idle RPG where players collect Skellies, build teams, manage castle workers, and push through adventure modes. This wiki focuses on practical routes: codes, beginner progression, Skelly roles, tier notes, events, and upgrade choices.

100K+ Google Play downloads4.4 star Google Play rating60+ collectible SkelliesUpdated Apr 15, 2026Android, iOS, and Windows availability

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What is Skull Up?

The game is a mobile idle RPG and hero collector from Efun. The official store pages describe collecting over 60 Skellies, combining teams, managing undead workers, and earning offline rewards through idle systems.

The game emphasizes flexible growth. Store copy highlights resource refunds for upgraded Skellies, which makes it safer for new players to experiment with team roles while learning campaign and event priorities.

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Developer
Efun Game Ltd. / EFUN PIONEER COMPANY LIMITED
Platforms
Android, iOS, iPadOS, macOS Apple silicon, Windows
Genre
Idle RPG, role-playing, card hero collector

Guide Modules

Jump into codes, beginner routing, tier notes, Skellies, team builds, events, and platform setup.

Beginner Guide

Start with a clean early route for tutorials, profile unlocks, first redemptions, idle worker setup, and safe Skelly upgrades. It keeps new players focused on systems that official store pages call out: team combinations, idle rewards, and loss-free growth.

1TutorialFinish enough tutorial progress to unlock profile and redeem features.
2Idle baseAssign workers so offline EXP and resources keep flowing.
3Refund testsExperiment with Skellies before committing to a final roster.
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Tier List

A practical tier-list hub for comparing Skellies by role, team fit, event access, and upgrade pressure. It avoids pretending every roster is identical and frames tiers around where a unit helps a real account.

SCarryDamage dealers that justify early resources.
ASupportBuffers, sustain, and control pieces that stabilize teams.
FlexNicheUnits that shine in specific modes or events.
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Skellies

A roster module for learning what Skellies do, how roles overlap, and why official copy emphasizes free combinations and smart strategies. Use it before spending major materials on a new pull.

Roster60+ SkelliesOfficial store copy describes collecting over 60 Skellies.
RolesTeam rolesBreak defense, provide support, and combine strengths.
GrowthExperimentResource refunding supports roster tests.
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Team Builds

Team-building guidance for campaign pushes, idle resource flow, and event rosters. The module helps players balance burst damage, frontline survival, support utility, and upgrade refunds.

1Front lineKeep fragile damage dealers from collapsing early.
2SupportUse buffs, sustain, or control to smooth clears.
3Swap testsRefund-friendly growth makes composition trials cheaper.
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Progression

Progression guidance for castle workers, offline rewards, upgrade loops, and resource timing. It focuses on the idle management systems that let accounts keep improving between sessions.

IdleWorkersSmelt, log, and mine for passive growth.
AFKOffline rewardsReturn to EXP and materials after downtime.
RoutePower spikesPlan upgrades around modes and events.
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Events

A events module for following official maintenance, seasonal events, server merge carnivals, and limited SSS or SSS+ arrivals. It is built around the official site news cadence.

LatestSummer BeachOfficial event notice dated July 2, 2026.
LiveMaintenanceOfficial maintenance notices continue after launch.
EventLimited SSS+Official notices cover limited artifacts, weapons, and Skellies.
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Platforms

Platform and download guidance for Android, iOS, iPadOS, macOS Apple silicon, and Windows availability. It helps players pick the right official store route and understand compatibility requirements.

StoreAndroidGoogle Play lists Android and Windows availability.
AppleiOSApp Store requires iOS or iPadOS 15.6 or later.
PCWindowsGoogle Play page lists Windows availability.
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Skull Up FAQ

Quick answers about Skull Up codes, Skellies, teams, events, and this independent wiki.

What is the game?

The game is an undead idle RPG and hero collector from Efun with Skellies, offline rewards, events, and flexible team building.

Is Wiki official?

No. This is an independent fan-made wiki and is not affiliated with Efun.

Ready to Master the Game?

Start with the beginner route, then compare Skellies, event windows, and build priorities as your roster grows.