head to head
Serious Sam 3: BFEvsTetris Ultimate
Serious Sam 3: BFE leans Execution (Pure Mechanics); Tetris Ultimate leans Execution (Pure Mechanics).
Serious Sam 3: BFETetris Ultimate
Axis by axis
Execution8 vs 9
Tetris Ultimate leans harder on execution: Piece placement speed under acceleration is everything
Reads0 vs 1
Tetris Ultimate leans harder on reads: Versus garbage exchanges allow slight opponent timing awareness
Variance2 vs 2
Even - both lean on variance about the same.
Optimization4 vs 4
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.

