Here's a first scratch of a scenario for one map but there are already a lot of question to bring it all together.
Is there a big voice to tell the countdown loud enough to be heard across all the base and outside?
The player starts in a Spatial Research Building fraught with GIs. A fuse is about to be launched.It can be seen through a window standing on the launch pad. There is a building with an elevator to bring the pilot at the entrance on top of the fuse. This "tower" and the fuse are separated by a gap that is fullfilled with a gateway which deployment must be activated from the base by the player.
He must find a scientist because he's the only one who can activate the countdown by a eye recognition locker.
He has to bring him alive to the command board to launch the countdown, reach the tower and go up before the ignition.
Then again he must bring the scientist to the fuse entrance to open it by an eye recognition locker.Once aboard the fuse lands up (earthquake, big roaring...). Then the scenarii misses me. Could be another map on any alien planet...
Where should I start to make this happen in Halflife ?