Hi, the only end game I found was, teleport to get the instruction card (I assume from your message you didn't find it: take the stairs downward and cross the bridge, after the brigde go through one of the 3 doors, there you find a code to teleport,and the instruction card.)
So :
Step 1: teleport to the instruction card
Step 2: come back to the main ''hub'' before the bridge is destroyed
Step 3: teleport to the computer requiring the instruction card, then wait for the end of the timer or suicide by falling.