Premium Theme

Retro

Pixel-perfect sprites, chiptune-ready aesthetics, and Fibonacci mathematics that would have blown the mind of any 1980s arcade player. Defend the grid.

Unlock with Premium

Tower Arsenal

All 8 tower tiers — each deals its Fibonacci number in damage

T1
1
dmg
T2
2
dmg
T3
3
dmg
T4
5
dmg
T5
8
dmg
T6
13
dmg
T7
21
dmg
T8
34
dmg

Enemy Waves

9 enemy tiers — HP increases with each tier, demanding more complex Fibonacci solutions

?
Tier 0
?
Tier 1
?
Tier 2
?
Tier 3
?
Tier 4
?
Tier 5
?
Tier 6
?
Tier 7
?
Tier 8
Boss Encounter

Final Boss

The classic eight-bit final boss, demanding pixel-perfect Fibonacci tower sequences to defeat.

Unlock Retro

This theme is part of the premium unlock — along with all other themes, endless mode, and every difficulty level.

Unlock Premium

One-time purchase — unlocks all 7 themes and everything else.