For some reason, a blue keycard always seems to be the second one you need.

Don't let those pesky UAC doors hold you down - open the doors with keycards, explore their secrets, grab all the ammo, weapons, and powerups, and slay all demons that hid from you.

.: Coating produces great color reproduction
.: 2" square porcelain with a magnet mounted to the backside
.: Glossy finish

Doom is a video game series and media franchise created by John Carmack, John Romero, Adrian Carmack, Kevin Cloud, and Tom Hall - ID Software at the time - and all rights belong to them. If you haven't already, you should play it - it's hellishly good!

Read more about it here.

Immerse yourself in Doom with a vid below ↓