Incremental Idle RPG Where Every Tap Builds Your Cosmic Empire
Master the prestige loop. 50+ strategic upgrades unlock exponential growth. Your empire expands even while you sleep. Pure incremental progression without artificial limits.
Download Hollow StarClaim your starter bonuses and accelerate your cosmic ascension
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Hollow Star operates on a dual-currency economy where stars and void essence interact through multiplicative scaling formulas. Each prestige reset converts accumulated stars into permanent void multipliers ranging from 1.5x to 250x depending on your timing strategy. The optimal prestige point sits at approximately 80% efficiency loss - reset too early and you waste potential, too late and diminishing returns kill your growth rate.
The upgrade tree branches into three distinct paths: production speed multipliers that compound exponentially with each tier, cost reduction nodes that create efficiency breakthroughs at specific thresholds, and prestige accelerators that reduce the time between meaningful resets. Strategic players focus on balancing all three paths rather than maxing a single branch, as cross-path synergies unlock at upgrade levels 10, 25, and 50.
Offline progression calculates at 60% efficiency for the first 8 hours, dropping to 40% until the 24-hour mark, then holding steady at 25% indefinitely. This prevents infinite idle gains while still rewarding players who check in daily. The system tracks your last 10 active sessions to establish baseline production rates, meaning consistent engagement directly improves your offline earnings through a hidden activity multiplier.
Reset your progress to unlock permanent multipliers that compound with each cycle. The prestige calculator shows real-time efficiency curves, helping you identify the mathematically optimal reset point. Each prestige grants void essence scaling from 1.5x to 250x based on your accumulated star count at reset. Master the timing to maximize long-term exponential growth.
Three distinct skill trees offer production speed multipliers, cost reduction breakthroughs, and prestige accelerators. Upgrades unlock at levels 1, 5, 10, 25, and 50 with cross-path synergies creating powerful combinations. Each tier requires exponentially more resources, forcing strategic allocation decisions. Late-game upgrades provide 1000x multipliers when properly sequenced.
Your empire generates resources at 60% efficiency for 8 hours offline, 40% until 24 hours, then steady 25% indefinitely. The system analyzes your last 10 active sessions to establish baseline production and applies a hidden activity multiplier. Consistent daily engagement can boost offline rates by up to 35% through this adaptive algorithm.
Stars serve as your primary production currency with exponential scaling formulas. Void essence acts as permanent prestige currency that multiplies all star generation. The exchange rate between currencies shifts based on your current prestige tier, creating dynamic optimization puzzles. Advanced players manipulate currency conversion timing to exploit rate fluctuations.
Production rates follow compound growth equations where each upgrade multiplies rather than adds to your output. Early game sees linear progression, mid-game unlocks quadratic growth at prestige 5, and late-game achieves exponential curves after prestige 15. The math ensures perpetual progression without artificial caps or paywalls blocking advancement.
Complete 40+ challenges that grant permanent stat bonuses and unlock hidden upgrade paths. Achievements track total stars generated, prestige count, upgrade milestones, and time-based challenges. Each completed achievement adds 2-5% to specific multiplier categories, creating meaningful long-term progression beyond the core prestige loop.
Free on Android 5.0+. No account required. Installs in under 60 seconds. Offline progress starts immediately.
Download for Android45 MB download. Rated Everyone 10+. Contains optional in-app purchases. No forced ads during gameplay.