While most of the bonuses may appear completely random, the game actually keeps a series of internal (and unseen) counters about events such as number of jumps, jumps over bubbles, bubble bursts, bubbles blown, maximum number of monsters blown in a certain round etc. These events are actually used to determine which bonuses will appear, and to a certain extent when they will appear.
Bub makes a cameo appearance in the MMORPG MapleStory on a board in the games square in Henesys.
The game forbids the initials SEX on the high score table. If you try, it gets changed it to H.!. In Japan, the letter H is occasionally used as a slang term for perverts.
Tom Gault holds the official record for this game with a score of 5,823,600 points on March 4, 1988.
The highest possible score is 9,999,990, at which point the score stops increasing.