How do I set a timer for a map like on the level The Maw when you have to escape the POA? I was thinking of a map where at the end thousands of flood charge at you and there is a timer for you to get to a device that eliminates all the flood, before they destroy it, so basically if the timer goes out it will play a cutscene where the flood shoot at it and I would script a explosion to go off there and I would delete it after. Thanks.

http://forum.halomaps.org/index.cfm%3Fpage=topic&topicID=33727

If you use the script extractor to read some of The Maw's scripts, you could probably find something in there that shows the commands they used to get the timer and giant explosion to work.

heres a script for a six minute timer that does nothing but display and run the timer.

(script_startup hud_timer
(show_hud_timer true)
(hud_set_timer_position 0 0 bottom_right)
(hud_set_timer_time 006 000)
)