Tiny Sol is a free, Tiny Sol Klondike Solitaire game designed for vintage PCs, especially those with monochrome screens. It runs in 640×400 mode on the GRi D gas‑plasma display, delivering sharp visuals on 3KB of code.

Features include: runs on any 8086 an up, supports CGA, AT&T, EGA, and VGA graphics, changes video modes on the fly (F1‑F4), keyboard or mouse play, in‑game Hats‑on‑save/restore, auto‑finish when possible, and Microsoft‑style scoring without a timer.

Compatibility has been verified on real hardware (8088, 286, Pentium) and emulators (DOS Box). Supported video modes (CGA 640×200, AT&T 6300 640×400, EGA 640×350, VGA 640×480) auto‑detect unless 640×400 AT&T is required, which is automatically selected on some GRi D computers.

Tiny Sol was written in x86 Assembly with NASM in early 2022, aiming for a sharp look on GRi D displays while staying small enough for ROMs. Version v1.3 (5/25/2026) adds scoring, save to file, and auto‑finish. The game debuted in hard‑copy form at Vintage Computer Festival Southwest 2026, with 16 copies on 360K, 1nano, 720K, and 1.44MB diskettes.