Portal Slingshot is described as 'You are equipped with a portal slingshot that allows you to shoot two portals that connect the space between them together. Completing the puzzles require the use of physics( mostly gravity). At the end of each level you will find a tasty slice of cake!'. There are four games similar to Portal Slingshot for a variety of platforms, including Windows, Linux, Mac, Playstation and Steam. The best alternative is Portal. It's not free, so if you're looking for a free alternative, you could try Mari0 or Doctor Hoctor Boing.
Portal™ is a puzzle game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative games on the horizon and will offer gamers hours of unique gameplay. Represent entire series of Portal games.
On a verge of a great discovery, Doctor Hoctor Boing has been sabotaged, Doctor Hoctor and his laboratory companion the squirrel have been framed by the Professor Crappy. The lab's compounds stolen and professor Crappy ran through a puzzle of portals! What to do?!