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To teach recursion concept for novice computer programmers.
use WASD keys to move the hero.
use Up Arrow to shoot bullet towards hero's up.
use Left Arrow to shoot bullet towards hero's left.
use Down Arrow to shoot bullet towards hero's down.
use Right Arrow to shoot bullet towards hero's right.
Kill the Spawning points before killing the enemies. This will make the level easy.
The player has to take the POW before starting to shoot the enemies.
The player has maximum of three bullets to shoot; player gets back them when the bullets hit either the wall, enemy or spawn point.
Enemy takes 2 shots to be killed.
Spawn point takes 3 shots to be killed.