head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
A relentless wave-clearing shooter that tests sustained aim and movement against massive scripted enemy crowds.

Execution · Pure Mechanics
Tetris with a puzzle mode - still a test of placement speed and stacking craft.
Painkiller (2004) leans Execution (Pure Mechanics); Tetris Plus leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Painkiller (2004)
Constant crowd-control movement against overwhelming enemy counts demands fast aim
Tetris Plus
Piece placement speed under pressure decides everything
Tetris Plus leans a little harder on reads, though the gap is small.
Painkiller (2004)
All enemies are scripted waves with fixed attack patterns
Tetris Plus
Versus mode adds only light opponent awareness
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Painkiller (2004)
Enemy counts and placements are fixed with minimal unknown elements
Tetris Plus
Random piece order is bounded and rapidly mappable
Painkiller (2004) leans a little harder on optimization, though the gap is small.
Painkiller (2004)
Tarot card selection and level routing provide a thin solvable layer
Tetris Plus
Puzzle-mode professor routes have known optimal solutions
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.