From now until 12/31, you can purchase a special bundle featuring 10 Death Metals for $0.99.
Snag a fancy new Premium Decal or power your way through the Tower. The choice is yours, senpai. Just make sure to grab it before it's too late!
You can find the bundle here or in-game via the Direct Hell menu: 10 Death Metals for $0.99.
*This bundle may only be purchased one time.