Makes you think
This is a fun little game that really makes you NEED the powerups.
You Really NEED to upgrade power or the Zombie Soldiers will be on you long before they fall over.
Those fast buggers need at least 2 ranks in power to hold them in place much less knock them back between shots .
Two ranks Headshot are ESSENTIAL for dispatching the Scientists.
I have no idea how to deal with the Mummys.
The Landmines are fun but make the game a little too difficult by BLOWING YOU UP if the zombies get too close before the animation for droping it finishes.