head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Pure Optimization
A deep tower defense about popping waves of balloons with monkey towers.

Optimization · Pure Optimization
An elegant hex-grid logic puzzler that is always solvable by deduction alone, never guessing.
Bloons TD 6 leans Optimization (Pure Optimization); Hexcells leans Optimization (Pure Optimization).
Bloons TD 6 leans a little harder on execution, though the gap is small.
Bloons TD 6
Placement clicks only; no dexterity ceiling
Hexcells
Clicking hexes calmly; no physical test.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bloons TD 6
Bloon waves are fixed and known
Hexcells
No opponent exists.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bloons TD 6
Wave order is deterministic; tiny targeting randomness
Hexcells
Designed to need zero guessing; full information.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bloons TD 6
Tower placement, upgrades, and economy are near-solvable
Hexcells
Minesweeper-style pure deduction is the entire game.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.