Episode 4

Episode 4 [also known as "Battle for the Moon"] is the fourth episode of Red Ball 4. New boxes like Moon Boxes make their appearances in this episode. Triangle-like triggers also appear in this episode, and work similar to buttons in Episode 2.

History
As its namesake says, it takes place in the moon, also known as Earth's moon. As with Episodes 1 to 3, the moon turned into a moon as well.

Plot
After Red Ball successfully made the Earth into a circle again, (because Red Balls live there) a box launched himself with a rocket towards the moon, turning the moon into a box. Red Ball then knew what to do to save the moon.

Difficulty
Despite being the 4th world of the Red Ball 4 Series, it is not too much of a hard world. It does contain somewhat 3 hard levels, which are Levels 50, 53 and 58, mainly because of lasers, speed boosters and gravity changers. And somewhat hard-hard (or very hard considered by player) level, which is Level 60, the boss level. Thus, it is not harder than its previous world, Box Factory, at all.

Easiest Level: Level 46

Hardest Level: Level 60

Boss for this world: Moon Boss He acts similar to Monocle Boss but with few differences. Gravity changes each time in the first 3 hearts of the boss, and he jumps around with additional gravity changing rapidly, making it a very hard level.

Trivia

 * Red Ball's mass seems to slightly change a bit, when he jumps or falls.
 * After Episode 4 got released, they added a new death animation when killed by lasers, which looks like Red Ball got electrocuted.
 * Overlapping at the top of the device (which is used by gravity changers) causes Red Ball to get killed, similarly to falling down a gap.
 * This is the only episode to take place on a different planet.
 * This is the only episode to change gravity.