Download of Super Impossible Road 1.5.3 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Games, more precisely Racing. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X was originally developed by Rogue Games, Inc.
From the developer:
Super Impossible Road lets you race online or on the TV screen with up multiple players at once. You are challenged to master hairpin turns across dangerous courses that twist and coil over beautiful galactic backdrops. You are allowed to knock opponents into the void of space. You can kick into hyperdrive with temporary speed boosts.
You may want to check out more software for Mac, such as Road Runner Office, Impossible Flappy or The Impossible Jump, which might be similar to Super Impossible Road.
Strategy
Racing