In CC1 (MS)
In MS, Chip's main goal is to gain membership to the Bit Busters Club. To gain membership, he must beat Melinda's clubhouse, which constitutes the game of Chip's Challenge. Upon completion of level 144, Chip receives a message telling him that he has gained access to the Bit Busters Club, but he can also continue to explore the "secret levels" of the clubhouse (levels 145 to 149).
In CC1 (Lynx)
In Lynx, the Bit Busters Club is mentioned and plays an important role, though not as important as in MS. Melinda says that if Chip comples her challenge, he can become a member of the Bit Busters Club and take her to the Bit Busters' "E-Prom" (a pun on EPROM). Chip is more interested in Melinda and taking her to the E-Prom than joining the Bit Busters Club in Lynx than in MS. However, in the end of the Lynx version, Chip achieves both goals.
In CCLP2, it is stated that one day, at lunch, Chip asked Melinda if she had more levels to play. She replies that the members of the Bit Busters Club (a.k.a Chipsters) have constructed another clubhouse and that it is ready to be played. This clubhouse contains the levels of CCLP2.