Alt-Shift is … well … let’s quote the site: It’s the “latest entry into the Negative Space Exploring Puzzler Shift! Which is the floor and which is the roof? Gravity flips, space changes and Spikes hurt! Its got so much in it it might just explode! So get ready to have your mind warped by this brand new take on the Flash Classic!” Whatever all that means, I don’t know, but it’s still a fun game, that I’m assuming is a sequel to this and this.