Rediscovering some games of the 2600's twilight years: Double Dragon, Pete Rose Baseball, Kung Fu Master, and River Raid II. Good games buried under steep learning curves.
Both the 2600 and Intellivision got a surprising number of good games in the late 80s and early 90s. Remarkable for two consoles that had been around since the 70s.
River Raid II is one latter-day 2600 title that I've been meaning to spend more time with, along with Solaris.