Game Boy with games

Goodwill, you've done it again! I found this little gray block with an a/c charger for only a few bucks, both of 'em in a plastic bag. As for the games, each of them were just a few dollars with Link's Awakening as an exception, I guess because it's one of the best games on the system, so that cost me the most out of the collection. Either way, the GameBoy plays like a charm, and I was a dope at first after taking like a half hour to figure out that it had a contrast switch, so I was wondering why my games were playing in a black screen xD