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.

Execution · Pure Mechanics
The classic execution-under-acceleration test wrapped in an immersive audiovisual experience.

Execution · Pure Mechanics
A twin-stick arena blaster testing sustained dodging reflexes and upgrade picks.
Tetris Effect: Connected leans Execution (Pure Mechanics); Ultratron leans Execution (Pure Mechanics).
Tetris Effect: Connected leans a little harder on execution, though the gap is small.
Tetris Effect: Connected
Precision placement under acceleration is the entire skill ceiling
Ultratron
Twin-stick dodging through bullet swarms is the entire test
Tetris Effect: Connected leans a little harder on reads, though the gap is small.
Tetris Effect: Connected
Zone-battle opponents exist but format leans on execution
Ultratron
Robots swarm in fixed behaviours, nothing adapts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Tetris Effect: Connected
Piece bag is bounded random but quickly mappable
Ultratron
Enemy spawns and power-up drops shuffle each level
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Tetris Effect: Connected
T-spin and stacking strategy is knowable but execution overrides it
Ultratron
Upgrade pet-and-perk choices shape survivability
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.