First post, by thp
Here's a little 1-hour DOS game hack: LuminDOS, a Lumines Clone for MS-DOS, using text mode + PC Speaker sound: https://thp.itch.io/lumindos
Use DOSBox or a real PC (>= 80386). In DOSBox, you might need to up your CPU cycles (Ctrl+F12).
This is a super quick implementation and not optimized in any way. Would love to convert this to VGA + Adlib sound (with different sound tracks and visual themes?), but alas, free time is as always in short supply.