I've read that "retro" is 15 years, but only pre-Doom is retro to me. Damn. Are you me? I had Boulder Dash 1+2 for the PC back in the 80s, and I think Impossible Mission 2 came with a 1987 Epyx catalogue which showed Boulder Dash Construction Kit for PC. I searched high and low for that game. I rang game stores interstate. One place had it listed, but couldn't get it in. I even contacted First Star Software, but they were more interested in selling their new versions. Finally, some 15 years later, I tracked down a copy through a game trading web site. Didn't run on modern hardware so I think I ended up using an abandonware version. I'd go with: Wonderboy (arcade) Wonderboy in Monsterland (arcade) Xain'd Sleena (arcade) Black Dragon (arcade) R-Type (arcade) Gaplus (arcade) Impossible Mission (C64) Impossible Mission 2 (PC) Boulder Dash series (mostly 1+2 on PC) Nethack (PC) Bubble Bobble (PC), Shinobi (arcade), Lode Runner (PC), Karnov (arcade), Micro Machines 2 (PC) were also great. Hard to narrow it down to 10.