Red Ball goes into the caves in the last, fifth, episode. As in previous episodes, there is also a new type of enemies that are similar to exploding squares from the third episode. The difference is that these new exploding squares spines will fly out into the neighborhood and each contact will cost you a live. Close explosion can take all three lives at once too.
Some parts of the episode are also more complicated due to the spines from the ground or the ceiling that need to be avoided (skip). When the last boss is defeated, the last thing to do is to free Red Ball’s girlfriend. Again an episode can be played in about half an hour.
The first part of the episode “Into the caves” – levels 61 to 69:
The second part of the episode “Into the caves” – levels 70 to 75, including the final part with the boss: