head to head
vs
Halo 3vsTetris 99
Halo 3 leans Execution (Pure Mechanics); Tetris 99 leans Execution (Pure Mechanics).
Halo 3Tetris 99
Axis by axis
Execution8 vs 9
Tetris 99 leans harder on execution: High-speed stacking and finesse define survival
Reads5 vs 4
Halo 3 leans harder on reads: Equal-start fights reward predicting humans
Variance2 vs 4
Tetris 99 leans harder on variance: Incoming garbage timing and piece sequence add chaos
Optimization5 vs 5
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.