Terraria is a platform game, just like Mario. I just got it this week. It's kind of like Minecraft. It has different biomes and items. It's got more resources and tools and tons of bosses and enemies. The music is great. Every boss has its own theme song. Here are some of the bosses.
Bosses:
King Slime.

The Eye of Cthulhu.
Eater of Worlds.
Brain of Cthulhu.
Skeletron.
Queen bee.
Hard Mode bosses:
Queen slime
The Twins
The Destroyer
Skeletron Prime
Duke Fishron

Plantera
Gollum
Lunar Cutlass
Moon Lord
Martian Madness bosses:
Martian Saucer

100 and 1 Scootles
Frost Moon bosses:
Everscream

Naughty Santa
Ice Queen
Pumpkin Moon bosses:
Evil wood
Pumpking

31 pumpkins
Those are all the bosses for now.
So bye-bye, have a happy day.