http://www.realmofthemadgod.com/
Just one more character... Just one more...
....
Alright, on a more of an explanatory note now, Realm of the mad god is an 8 bit MMO fantasy shooter where you play as a little sprite of a fantasy class, and you attack by holding down the left mouse button and firing off spells, or throwing swords, or whatever it is that your class does to attack. The level cap is 20, and you level up absurdly fast, but here's the twist.
When you die, your character is gone forever.
I'm really not sure how to describe it in full, honestly, it's just something that you have to experience yourself to truly gain an understanding for. Give it a shot, it'll take 10 minutes before you decide rather you like the game or not.
Also, try to take part in a train at some point, don't ask what it is, just look for one.
