head to head
Impossible Mission asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
C64 classic about somersaulting past robots to assemble a password.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Impossible Mission leans Execution (Practiced Mastery).
Impossible Mission leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Impossible Mission
Pixel-precise flips past patrolling robots
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Impossible Mission
Robots patrol on fixed behaviours
Impossible Mission leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Impossible Mission
Puzzle pieces randomized each playthrough
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Impossible Mission
Search routing under the time limit
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.