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

Optimization · Pure Optimization
Bleak Ellison adaptation where five tortured souls face a sadistic AI.

Optimization · Systems & Chaos
An FMV horror adventure where Gabriel Knight hunts a werewolf cult tied to mad king Ludwig II of Bavaria.
I Have No Mouth, and I Must Scream leans Optimization (Pure Optimization); The Beast Within: A Gabriel Knight Mystery leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
I Have No Mouth, and I Must Scream
Pure point-and-click, no dexterity
The Beast Within: A Gabriel Knight Mystery
Clicking through FMV scenes; nothing physical.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
I Have No Mouth, and I Must Scream
AM is scripted despite the menace
The Beast Within: A Gabriel Knight Mystery
Werewolf cult actors follow a fixed script.
The Beast Within: A Gabriel Knight Mystery leans a little harder on variance, though the gap is small.
I Have No Mouth, and I Must Scream
Obscure solutions hidden until discovered
The Beast Within: A Gabriel Knight Mystery
Lycanthropy mystery conceals the truth until investigated.
I Have No Mouth, and I Must Scream leans a little harder on optimization, though the gap is small.
I Have No Mouth, and I Must Scream
Puzzle chains and ethical-path knowledge
The Beast Within: A Gabriel Knight Mystery
Dual-protagonist investigation is a fixed solvable sequence.
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.
full breakdown
I Have No Mouth, and I Must Scream →
full breakdown
The Beast Within: A Gabriel Knight Mystery →