1) You will first start the game, make sure you grab the gas mask and lvl 1 keycard to get you going
2) Keep a look out for 106/173 for they can spawn ANYWHERE.
3) Later in game, you will find SCP-914, make sure you found a lvl 2 card so you can enter
4) While using SCP-914, you are an open target to SCP-106, so move around a lot and if he does come, be prepared.
5) After using SCP-914 to pimp up your items, carry on to the Light Containment Zone.
6) In most causes, SCP-106's containment room can be found. So try to contain him!
7) Look around for important equipment and still, keep a watch for 173 or 106.
At some time, you will come to SCP-106's maintenance tunnels, but if you have alreadycontained him there will be no problem, just look out for 173.
9) And again, at some point you will reach SCP-096's sever room, just flick the switch's to "Generator", then
in the small room flick it to "Main". Then you can get out but ALWAS keep your eyes to the celling/floor
to avoid being killed.
10) When you reach the entrance zone, make sure you have a lvl 5+ keycard.
11) When you reach the electricity center, always go into it. Flick the door control the opposite way it is.
12) After your done that, if you want a Gate B ending, you would of had to found SCP-079 and try to reach it again.
After he's done talking go back to the electricity zone and flick the Door control the way you found it. Then find Gate B.
13) If you want a Gate A ending, all you have to do is follow the instruction above (Except the SCP-079 part) and then
find Gate A.
I hope this helped you out if you where stuck,
