The PSP was one of the last major platforms to heavily utilize physical media (UMD - Universal Media Disc).

The point was this: on a rainy Tuesday, after a fight with his mom about rent, Leo sat on the floor of his empty room and dug a hellevator. Straight down. Two blocks wide. He placed torches as he fell, watching the background change from dirt to rock to lava glow. He landed with a splash in a pool of magma, died, and respawned back in his dirt hovel.

If you're new to Terraria on PSP, here are some tips to get you started:

The Vita version of Terraria , released shortly after, was technically superior in every way: