head to head
Puyo Puyo! 15th Anniversary asks more than Dead Space 3, and the gap is reads.

Execution · Practiced Mastery
A crafting-heavy survival shooter where weapon-build optimisation and aimed dismemberment carry the loop.

Execution · Practiced Mastery
A competitive falling-blob puzzler about chaining combos faster than your opponent.
Dead Space 3 leans Execution (Practiced Mastery); Puyo Puyo! 15th Anniversary leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space 3
Weapon crafting alters execution demands but shooting stays central
Puyo Puyo! 15th Anniversary
Fast blob placement under pressure demands quick hands
Puyo Puyo! 15th Anniversary leans clearly harder on reads.
Dead Space 3
All enemies scripted; co-op adds coordination not prediction
Puyo Puyo! 15th Anniversary
Versus play rewards reading opponent chain timing and counters
Puyo Puyo! 15th Anniversary leans a little harder on variance, though the gap is small.
Dead Space 3
Scavenger bot loot adds mild RNG to crafting resources
Puyo Puyo! 15th Anniversary
Next-piece queue is random but bounded and visible
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space 3
Deep weapon crafting system rewards systematic optimisation
Puyo Puyo! 15th Anniversary
Building large chains is a learnable scoring system
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.