This is a lot of two Japanese Game Boy Color games and one Japanese Game Boy game. Their condition varies, see pictures, but their contacts have been cleaned thoroughly. The batteries of the three games were tested with a multimeter and found to be functional, and the games themselves were tested and found to be functional as well. The games are:

Donkey Kong GB: Dinky Kong & Dixie Kong (Game Boy Color)

Monster Race 2 (Game Boy Color)

Super Mario Land (Game Boy)