diff --git a/Penetrator.dsk b/Penetrator.dsk
new file mode 100644
index 0000000..aeb4938
Binary files /dev/null and b/Penetrator.dsk differ
diff --git a/README.md b/README.md
index 4996400..6e8b59e 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,9 @@ attract mode, and the fireworks.
 Here's a video of Oliver Schmidt's son, Pascal, playing the game on real
 hardware: https://www.youtube.com/watch?v=rXC2JKuN594
 
+There's also a pre-built Apple II disk of the project, Penetrator.dsk in the
+root folder.  This can be played directly in emulators.
+
 3. TECHNICAL DETAILS
 
 The game is written in 6502 assembly using the ca65 assembler.