head to head
Neither is simply harder - they are hard in different places. Helltaker demands more optimization; Hotel Dusk: Room 215 demands more variance.

Optimization · Pure Optimization
Short free sokoban puzzler about assembling a harem of sharply dressed demon girls.

Optimization · Pure Optimization
Noir DS adventure about interrogating hotel guests to unpick a mystery.
Helltaker leans Optimization (Pure Optimization); Hotel Dusk: Room 215 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Helltaker
One bullet-dodge finale aside, no dexterity
Hotel Dusk: Room 215
Stylus puzzles need negligible dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Helltaker
No opponent
Hotel Dusk: Room 215
Characters follow a fixed narrative script
Hotel Dusk: Room 215 leans clearly harder on variance.
Helltaker
Fully deterministic puzzles
Hotel Dusk: Room 215
Story info hidden until questioned out
Helltaker leans clearly harder on optimization.
Helltaker
Each sokoban level has an exact move solution
Hotel Dusk: Room 215
Choosing right dialogue and solving set puzzles
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.