Algodoo

The Marble Race of Seven Eliminations part 1.
There are 63 marbles. Seven eliminations every round. Slowest 7 will be eliminated.
There will be 3 winners, and 2 runner-ups.
Credit to all. Tell me which 7 are eliminated.
Leg 1: Bowls (63 marbles)
Leg 2: Spinners (56 marbles)
Leg 3: Alternators (49 marbles)
Leg 4: Chutes (42 marbles)
Leg 5: Gravity (35 marbles)
Leg 6: Teleporters (28 marbles)
Leg 7: Easy Shooter (21 marbles)
Leg 8: Hard Shooter (14 marbles)
Leg 9: Combination (7 marbles)