Sprint 4P is a race with 3 other players to see who can clear 40 lines the fastest.
Are there rewards for making combos?
There are no rewards for making combos in Sprint 4P so try your best to clear lines as fast as possible.
Sprint 4P - Why do I have to clear more lines than my friends?
If you and your friends are playing against each other with different ranks, for example you are at rank 12 and they are rank 3, Sprint 4P will make your friends clear fewer lines than you. This way you will always having a challenging match regardless what is your friends’ skill levels.