 The bonus round premiered in 1981 on the daytime edition.  Originally, contestants chose to play one final puzzle for a grand  prize they selected from five on stage. They chose five consonants  and a vowel. In 1988, they were spotted five consonants (R,S,T,L,N)  and one vowel (E), and chose 3 more consonants and one vowel. In  1989, the prizes were hidden under letters W H E E L, and the  contestant picked a letter, winning whatever prize the letter  concealed. That changed in 2003, to where contestants spun a mini  wheel that selected the prize.