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 futuristic city-builder where eco and industrial factions race to settle a flooded Earth.

Optimization · Pure Optimization
An elegant hex-grid logic puzzler that is always solvable by deduction alone, never guessing.
Anno 2070 leans Optimization (Pure Optimization); Hexcells leans Optimization (Pure Optimization).
Anno 2070 leans a little harder on execution, though the gap is small.
Anno 2070
Building and routing, no reflexes
Hexcells
Clicking hexes calmly; no physical test.
Anno 2070 leans a little harder on reads, though the gap is small.
Anno 2070
Faction AI is scripted
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.
Anno 2070
Map generation varies resources slightly
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.
Anno 2070
Eco-versus-industry chains reward exact balancing
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.