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 vault management sim about optimising dwellers, rooms, and resource loops.

Optimization · Pure Optimization
Tactical action-point puzzles threaded through a branching hidden-truth narrative.
Fallout Shelter leans Optimization (Pure Optimization); The Hundred Line: Last Defense Academy leans Optimization (Pure Optimization).
The Hundred Line: Last Defense Academy leans a little harder on execution, though the gap is small.
Fallout Shelter
Tapping menus only
The Hundred Line: Last Defense Academy
Turn-based tactics and reading require no dexterity
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
The Hundred Line: Last Defense Academy
Monsters and classmates follow authored scripts
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
The Hundred Line: Last Defense Academy
Route branches and story twists are hidden information to uncover
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
Dweller stats and room layout are fully solvable
The Hundred Line: Last Defense Academy
Action-point puzzles and route planning are the solvable spine
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.