While happy to be moving up the ranks from level twenty to twenty-one, I am sad to see Metal Slime go. Of course, Metal Slime is from one of my favorite video game franchises, Dragon Warrior. I'm nearing the end of Dragon Warrior IV for the NES. I first beat it many years ago in about twelve days. I had mono, so I just laid on the couch and spent my timesleeping and playing video games.
This time around I'm playing in on an emulator on my phone. I have it wherever I am, so it's not such a big boring deal to grind anymore to gain levels. I just pull it up when I am a passenger in the car or waiting for a meeting to start at work, or sitting in the bathroom. 
I usually refer to GameFaqs.com to make sure I am on the right track because I don't want to have to take notes while I play.
I'm not sure where the title Rescue Ranger comes from, though my first thought would be the Chip 'n Dale: Rescue Rangers game, also for NES. It's another game I played in my youth. I don't remember much about it except that it was decently fun.