By this time, you can only progress to one higher Dimension before the end of the game. If you are not in Dimension 5 already, the only chance you have of reaching it is if you finish Dimension 4 with two blue warp capsules.
These stages feature the giant space amoeba creature as the item container. There will only ever be one, and it sweeps back and forth across the screen. It takes sixteen shots to destroy, and this can be considerably difficult to accomplish considering how all of the appearing enemies will block your shots, and you have to worry about dodging their bullets as well.
In the following stages, zakos may transform into Zous (shown left). Zous start out as a single entity, and as it drops, it splits up into two entities. Then these two split up one final time for a total of four entities. All four drop to the bottom of the screen and loop back around one more time if they reach the bottom.
In Dimension 2, the sixth bonus stage features several enemies, including the standard Dimension 2 zako, goei and Boss Galagas. The only unique enemy that it features is the fly-like enemy called the Hae.
Eight zako, four from the upper left, and four from the upper right, staircase their way down near the middle of the screen, but never actually enter into it. Then they bounce back up to the screen edge, and exit through the sides.
Two zako drop down from the top of the screen, slightly apart. Then they climb back up before staircasing their way down to the sides of the screen that they are closest to, and exit.
Six goei drop from the top in groups of three, loop around once and come to a stop. Then they approach the middle, drop down and fan out. The left side circles downward while the right side circles upward. Then they meet in the middle and fan out upward before flying in a S curve down the middle, and exiting through the sides.
The fourth wave is identical to the third wave, but with two groups of four goei.
Eight Hae, four from the upper left, and four from the upper right, glide down, then travel across to the center, and then loop up and around to the outside edge before dropping down. Before they reach the bottom, they approach the middle, and loop outward again before climbing back up, and approaching the center. They perform a series of half loops which bring them in and out of the center, before flying back up through the top of the screen.
Two sets of Haes and Boss Galagas appear from the two top corners, drop down, and then converge along the middle and fly back up to the top, where they cross over the middle. Then they perform a series of half loops which bring them in and out of the center, before spreading out and exiting out through the sides.
In Dimension 3, the sixth bonus stage features an enemy called Zou, which means elephant. However, the waves will also feature common Dimension 3 enemies like zako, goei, and Boss Galagas. They move quickly here, so you have to be on your toes.
Two sets of four zakos appear from the upper left and upper right corners. They loop towards the middle and then back to the outside again before coming to a stop. Then they fly horizontally to the middle and cross over before looping up and around, criss crossing in the middle a few times. Then they bounce out through the sides of the screen.
A mix of two zako and two goei appear from the upper right and slide across the screen to the left, before gliding down on a curved path to the bottom of the screen and exiting through the lower left corner.
The second wave is the mirror image of the third wave.
Four goei appear from the upper right corner, drop down a bit, and then fly horizontally to the left. When they reach the middle, the fly diagonally down to the left, and the hug the edge of the screen as they fly up until they reach the upper left corner and exit.
The fifth wave is the mirror immage of the fourth wave.
Two sets of four Zou appear from the upper left and upper right corners. They approach the middle, then suddenly loop upward and away from it. Then they drop straight down towards the bottom before flying towards the middle, looping away from it again. They rise and fly towards the middle, looping away from it once more. Then they perform a sequence of short half loops that cross the middle of the screen, before exiting up through the top of the screen.
A mix of Zou and Boss Galagas appear from the upper corners of the screen. They drop straight down, and then approach the middle as they rise back up. They fly straight up to the top, and then cross in the middle. They drop down a bit and perform a series of short half loops, before crossing over one more time and then exiting through either side of the screen.
In Dimension 4, the sixth bonus stage features butterfly enemies known as Choucho. You would have seen them earlier as enemies which split off from zakos. There are a lot of attempts to fake you out throughout this bonus stage. Knowing how the enemies will behave will help you tremendously.
Two Boss Galagas appear from upper left and right corners. They curve down towards the middle, and stop in the center. They cross each other, double back twice, then cross again and exit through the center sides.
Two sets of four Choucho appear from the top, and curve to the right. They hit the right wall and separately bounce off to the left. Then they swoop down and back to the right. They bounce off the right wall again, and fly up, and then immediately fly back down. They pause before curving down to the left and exiting the screen.
Two sets of five Goei do the mirror image of wave two
Two sets of four zako appear from the left, and then split up before looping back around to the left, and pause where they meet up. They advance to the right and do another loop back to the left. Then the advance, and immediate about-face before flying up to the left, and then exit horizontally to the left in separate groups.
Two sets of one Boss Galaga and four ChouCho appear from the right, looping back around to the right. They pause where they meet up, and then advance before splitting up, one group flying down to the bottom, and the other up to the top, before flying to the left. Then they fly along the left side of the screen and meet up. They fly right to the center of the screen, and then curve upwards, before curving back to the right and exiting through the upper right corner.
In Dimension 5, the sixth bonus stage features the Tonbo enemies, which you would have seen earlier as enemies which split off from zakos. As the last and most difficult bonus stage to reach, the movements of the enemies are quite elaborate.
Two Boss Galagas appear from either side near the middle. They start approaching the middle, but then loop outward. They stop near the bottom and about-face. Thye approach the middle, slowly then fast, and then arc up as they intertwine to the top, and then curve outward.
Five Tonbo appear from the lower left corner, ad arc upward along the middle, before turning right near the top. They approach the edge, and then double back, and staircase down a bit before leaving the screen to the left.
The third wave is the mirror of the second
Five goei appear from the top and arc down and to the right. They bounce off the right side twice before arcing upward and fly up along the right side of the screen through the top.
The fifth wave is the mirror of the fourth, only with five zako instead.
Five goei appear from the lower left and snake back and forth up to the middle of the screen before crossing to the right. They stop, loop back to the left and arc upward through the top of the screen.
Five zako appear from the lower right. They fly in and arc outward and back to the left a bit higher. They cross the middle of the screen before turning to fly straight up, then straigh to the right, and then straight up again through the top of the screen.
Two sets of a Boss Galaga and three Tonbos fly in from the upper corners. They meet in the middle and curve downward and out a bit. Then they fly straight down, and the toward the middle where they cross just before flying straight down again. They cross again as they fly to the edges of the screen, and then straigh up before curving in to the middle. Then they cross in another arc upward before flying straight across near the top and exiting through the sides.
(
) 
(
) 
) 
) 
) 
(
) 
) 
/ 
) 
) 
