The 1-Upper: Shift 2
What’s black and white and red all over?
There’s no point in acting like Shift 2, and it’s predecessor, Shift, aren’t direct conceptual copies of Portal - at least the Web version - so I won’t. Both games are in the same exact vein (you’re a lab experiment and must make it through a series of rooms using your unique item or ability), but Shift 2 makes you think slightly differently. Instead of making entrance and exit portals with a portal gun, you can employ the shift key (go figure) to flip over to the dark side of the level, thus enabling you to make your way past spikes, pitfalls, and other assorted nuisances.
One thing that Shift 2 has over Portal and the earlier Shift is that the writing is pretty funny. The opening scene, where the omnipresent mad scientist’s spiked wall of death breaks down made me laugh early in the a.m.
Go play Shift 2 here.