Engine

Below is a list of the engines and how to obtain them.
 * E1 Standard
 * Obtained at the start.
 * E2 Modification
 * Obtained by reaching 100m in 20 seconds.
 * E3 Firefly
 * Obtained by reaching 300m in 45 seconds.
 * E4 Circle
 * Obtained by reaching 700m in 1 minute and 40 seconds.
 * E5 Furious cyclops
 * Obtained by reaching 800m in 2 minutes.