Keycards are a major element of the game, being the only item in-game that can open doors with a keycard slot. Keycards can be found in various places or get refined through SCP-914 to create other keycards. There are six keycard levels, 1 through 5 plus Omni. Level 0 is not in the game but it exists.
The level 1 keycard is the 2nd lowest level keycard. It can open the door to the electrical center, as well as the first door to the small testing chamber. The keycard can be found in the first room or in the 2-level office, beside a computer.
Safe access keycard.
Level 2 keycards can be used to open the doors to SCP-914's containment chambers. It is found in the basic office and small testing room. It can also be obtained by placing a level 1 keycard into SCP-914 on "Fine" or a MasterCard/Playing Card on "Very Fine".
Safe access keycard.
The level 3 keycard can be used to open the main door and the door to the staircase in SCP-106's chamber, SCP-895's chamber, SCP-079's chamber, SCP-012's chamber, the first door leading to SCP-714's and SCP-1025's chambers, The level 3 keycard can be obtained by placing a level 2 keycard in SCP-914 on "Fine"
This accesses Euclid level SCPs.
The level 4 keycard is found in SCP-106's containment chamber under a shelf beside the controls, next to the guard's body in SCP-895's chamber and SCP-049's containment chamber, right next to SCP-049's document. It is required to access the head office, the lower level of SCP-106's chamber, both doors in SCP-008's containment chamber and SCP-714's chamber. As of v0.8, this keycard can no longer be obtained with SCP-914; making obtaining a Level 5 Keycard more difficult.
This accesses Keter and Euclid level SCPs.
The level 5 keycard is required to open the door to the elevator leading to the warhead room, the door leading to the small control room in the warhead room, SCP-966's chamber and the door in the checkpoint room between the Heavy Containment Zone and Entrance Zone. It can be found in the head office, next to the control panels which captures 106 or obtained by placing a level 4 keycard in SCP-914 on "Fine".
Can access all doors.
The Omni keycard currently has no unique use, but can access anything requiring a keycard and is one of the optional objectives at the endgame. The Omni keycard can only be obtained via placing a level 5 keycard through SCP-914 on "Fine" or by placing any level keycard through SCP-914 on "Very Fine", however the chance of producing a MasterCard or Playing Card instead is significant. An achievement is awarded after obtaining the Omni card.
If you're wondering why the Level 0 KC isnt here. is because it has no purpose and is not yet in the game.