Level 7-3 has a time freeze button, which is extremely useful in the Disco Era and will then appear in levels 7-11 and 7-13.Level 7-1 gives the very basics of Disco Era mechanics, introducing a laser beam and a disco ball. Level 7-2 is barely harder with two crossing laser beams.
Level 7-15 is notable for having a periodic layout: a bubbled disco ball is going up into a portal, popping at the bottom of the level and going through the loop again and again.
The box image is a big disco ball reflecting Om Nom ancestor and a candy. The background of the levels has drawings of an audio tape, a vinyl disk, a disco ball and a guitar-shaped keyboard. The ancestor's style is that of 70s disco stars and idols: wearing an afro haircut and big shaded glasses.