time trial

Short definition from Wiktionary

Noun

1. 1
   An unpaced race in which riders or teams leaving at regular intervals are timed over a preset course or distance, the winner being the rider or team to finish in the fastest time.
2. 2
   Any competitive event in which competitors are timed rather than racing against each other.
3. 3
   A mode in which the main goal is to complete levels, or, in some cases, the entire game as quickly as possible.