Unlocking the extra firearm early pays off - Ctrl sprays whatever survives the blast while the bomb timer resets.

Space first, Ctrl second: I bomb the lab doors, roll back, then finish stragglers before the radiation meter jumps again.

Slot three stays reserved for the heavy weapon; the lingering damage keeps mutants from slipping away after a detonation.

FlashGamesBox lets me rerun routes in any browser until every bomb chain melts the next mutated wave on schedule.