Defence

Defence is a type of level in Jetshift where players stop invaders from reaching the cannon. It is played in the third and sixth levels of each world.

In Defence, the player must shoot their cannonballs (unlimited supply) at the invaders that pass in through one of the four different lanes.

The number of enemies that must be killed before the level ends increases for every world; Each defence level has four different waves, with difficulty increasing with every one.
 * In World 1, 200 enemies must be killed.
 * In World 2, 350 enemies must be killed.
 * In World 3, 600 enemies must be killed.
 * In World 4, 900 enemies must be killed.
 * In World 5, 1200 enemies must be killed.
 * In World 6, 1600 enemies must be killed, but after Devil Demon has been defeated, 2000 enemies must be killed.
 * In World 7, 2500 enemies must be killed.

There are two types of invaders, small and big. The small invaders only require one hit to get killed, but the big ones shrink after the first hit and require four more hits to die. The invaders have a 1-in-25 chance of spawning as a big invader and does not change if one has spawned. It is possible for 20 or more big invaders to spawn in a row.

If the player takes too long to kill one and they reach the centre, the level terminates immediately without warning, similar to how the level ends if The Crescent sets.

Tips

 * Mashing two fingers on the Space bar will allow for multiple bullets to clear one lane in as few as 40 shots.
 * Focus on one of the most crowded lanes first, if not the closest.