If you're not familiar, the Casual 20 is a stream project in which I work to finish all the games in the most recent Big 20, which only had two "Beat the game"-style goals in it. Some I've played many times before, while others are fairly new to me or I haven't played them in a while.
So far, the hardest/longest games have been StarTropics, a game I'm pretty sure I never actually beat as a kid (Although I got to the final dungeon), and Crystalis, a game I hadn't played in 25-plus years. Everything else, Blaster Master included, I've managed to beat in a single stream. And some of the games I've even thrown twists into, like playing through the US version of Super Mario Bros. 2 beating every stage with Mario (No one ever plays as Mario in that game).
I'm still updating the list as I go through the games, but if you want to watch my progress so far, it's here.