It has been 30 years since the original Space Invaders hit arcades, which then politely proceeded to relieve people of their hard-earned coins. The game was successful because of its addictive formula involving shooting never-ending fleets of alien creatures to get the highest score.

Although painfully slow-moving, these aliens are a persistent lot, and even if you’ve shot down tens upon thousands of their comrades, they valiantly persevere. In fact, the only thing that’s more persevering than these aliens is the Space Invaders franchise itself. Space Invaders Extreme has landed on the PSP—with the same addictive gameplay created 30 years back, the same pesky aliens and a graphical overhaul.