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

Optimization · Pure Optimization
A vault management sim about optimising dwellers, rooms, and resource loops.

Optimization · Systems & Chaos
A 3D mystery adventure where Gabriel Knight untangles a vampire kidnapping and the Rennes-le-Château grail enigma.
Fallout Shelter leans Optimization (Pure Optimization); Gabriel Knight 3: Blood of the Sacred, Blood of the Damned 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.
Fallout Shelter
Tapping menus only
Gabriel Knight 3: Blood of the Sacred, Blood of the Damned
3D camera fiddling, but no real dexterity test.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
No opponent
Gabriel Knight 3: Blood of the Sacred, Blood of the Damned
Vampires and treasure hunters are scripted figures.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
Incident spawns and lunchbox loot rolls
Gabriel Knight 3: Blood of the Sacred, Blood of the Damned
Rennes-le-Château mystery hides clues across timed days.
Fallout Shelter leans a little harder on optimization, though the gap is small.
Fallout Shelter
Dweller stats and room layout are fully solvable
Gabriel Knight 3: Blood of the Sacred, Blood of the Damned
Le Serpent Rouge geometry puzzle epitomizes fixed deep solving.
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
Fallout Shelter →
full breakdown
Gabriel Knight 3: Blood of the Sacred, Blood of the Damned →