Free
In-App Purchases
About
Jump the spikes. Hit the exact sum.
Neon rhythm dash. Grab the numbers that fit. Make the exact sum - or start over.
• Tap to jump through spikes, pads, and rings
• Hit the exact sum to clear the door
• 16 levels across five worlds
• Practice with checkpoints
• Endless and Daily after you beat Genius
• Earn stars for skins - looks only
• Game Center leaderboards and achievements
No ads. No tracking. No data collected.
Jump in. Hit the sum.
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What's New in Synth Sum
1.0.1
August 5, 2026
Levels remember where you left off. Pause and resume work reliably, and runs auto-pause when you leave the app. Smoother level select and navigation.
5
In-App Purchases
$1.99
Neon Kit
Skins, trail, and fail FX. Looks only.
