head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Lumines Remastered demands more optimization.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Optimization · Practiced Mastery
A rhythm-driven falling-block puzzler about building clears to the beat.
Grand Theft Auto V leans Execution (Practiced Mastery); Lumines Remastered leans Optimization (Practiced Mastery).
Lumines Remastered leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Lumines Remastered
fast block placement under time pressure
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Lumines Remastered
no opponent, purely solo puzzle
Lumines Remastered leans clearly harder on variance.
Grand Theft Auto V
Some mission and lobby randomness.
Lumines Remastered
random block sequences drive setups
Lumines Remastered leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Lumines Remastered
chain-building strategy and block-clearing timing
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.