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
The Myst sequel: a slow, wordless puzzle adventure solved by observing an alien world's internal logic.

Optimization · Pure Optimization
A fixed-solution puzzle adventure where finding the right inventory combination unlocks every obstacle.
Riven leans Optimization (Pure Optimization); The Secret of Monkey Island leans Optimization (Pure Optimization).
The Secret of Monkey Island leans a little harder on execution, though the gap is small.
Riven
Point-and-click; no dexterity required at all
The Secret of Monkey Island
Clicking inventory items demands no twitch skill whatsoever
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Riven
No opponent of any kind
The Secret of Monkey Island
No adaptive opponent; all puzzles are fixed and authored
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Riven
Information is hidden only until you observe it
The Secret of Monkey Island
Some hidden items require exploration but solutions are invariant
Riven leans a little harder on optimization, though the gap is small.
Riven
Deciphering the world's logic is one giant solvable puzzle
The Secret of Monkey Island
Correct item combinations and dialogue chains fully determine progress
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.