Boulders are objects that chase after Crash in the first Crash Bandicoot game and Crash Bandicoot 2: Cortex Strikes Back during the chase levels, with the exception of Un-Bearable in Crash Bandicoot 2 where a giant polar bear chases after him instead. A much smaller boulder appears in Crash Team Racing in the race track Blizzard Bluff, where it rolls from side to side, squashing any racer that hits it.
In Crash Crush, the player can considerably outrun the boulder. By beating the second boulder to the bridge and quickly jumping into the bonus level, upon re-entry into the main level the bridge will remain intact, free for the player to explore all the way through the section where the chase took place.
Also in Crash Dash and Crash Crush, there is no nitro switch crate, so Crash needs the boulder to run over the nitro crates to destroy them. However, if Crash is far enough ahead of the boulder to the point that it is not on the screen, then the boulder will not destroy the nitro crates.