Episode 5

Episode 5, also named "Into The Caves", is the last episode of Red Ball 4. This world takes place in the caves/underground. New boxes like Cave Box make new appearances in this world. Minecarts, and red-spike shooters are this episode's gimmicks.

This episode is added in Red Ball 4 ver. 1.3.11, along with some world-based achievements for this world.

History
This world, hence its name, is based on the caves, most likely a mineshaft due to minecarts appearing in the episode.

Starting Cutscene (Episode 5)
Red Ball and his girlfriend are here in the fields, having fun and tries kissing, but to no avail, she fell on a hole. So Red Ball goes in the hole to save her from the Evil Boxes.

Ending Cutscene (Episode 5)
After rescuing his girlfriend from the evil boxes, they celebrate the victory, which then the hole began to disappear, then looking at the players.

Music
Into the Caves Level Theme: https://www.youtube.com/watch?v=m_DiUR1AyYA Intense Boss Theme: https://www.youtube.com/watch?v=KWuNF6UgXok

Difficulty
Hence being the last and only world of the game, it is technically a very hard world, due to the new boxes and red-spike shooters. Cave Boxes spikes may trigger other Cave Boxes and would cause a spike rain, rapidly killing new players, increasing Cave Box's spikes threat level, spikes on levels and minecarts can insta-kill the player, regardless of health. And the red-spike shooters will cause either chaos or no trouble. And because of these reasons, it contains 3 somewhat hard levels, are levels 63, 69, and 72, and 2 hard levels, are 64 and 67, and 1 somewhat very hard level, which is level 73, 1 very hard level, which is level 74, and 1 somewhat hard-hard level, which is level 75. And because of the amount of hard levels, it contains 1 very easy level, which is level 61, and 2 somewhat easy levels, are levels 62 and 70, while it contains only 2 medium levels, which are levels 65 and 71, and 2 somewhat medium levels, are levels 66 and 68. Because of this, many children and new players consider it the hardest world in the game. And plus, It is significantly harder than its previous world, Battle for the Moon, & extremely harder than the first three worlds.

Easiest Level: Level 61 or Level 70

Hardest Level: Level 73 or Level 74

Boss for the episode: Cave Boss
The boss is somewhat hard-hard due to the last phase, which is to rescue Red Ball's girlfriend and the avoid the laid out red-spike shooters on the walls. So think harder and be quick to finish this level.

Trivia

 * Into The Caves and Battle for the Moon are the only worlds to move around if you hit a checkpoint, unlike the first three worlds, which you can't move back away from a checkpoint.
 * All levels require keys to exit each level with the exception of level 75.
 * The instruments it uses may be the clarinet and the bassoon.
 * At times (in Episode 5's pre-release), a Cave Box will act similar to Ram Box/Boom Box, making him a very easy threat.
 * This is the only episode to feature a boss that cannot be hit normally.
 * If one looks closely in the background (in levels only), the bat is shaped like a square.
 * This episode and its previous episode are the only worlds to not to be added in the game's first launch.
 * They also do not have a PC version on their own as well.