diff --git a/.gitignore b/.gitignore
index 8b45bb97..78ce5cb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,8 @@ test/songs/
 test/delta/
 test/result/
 test/assert_delta
+android/local.properties
+android/.idea/
 android/.gradle/
 android/app/build/
 android/app/.cxx/
diff --git a/demos/arcade/physics_exam.fur b/demos/arcade/physics_exam.fur
new file mode 100644
index 00000000..b26e3f6e
Binary files /dev/null and b/demos/arcade/physics_exam.fur differ
diff --git a/demos/genesis/inside_the_computer.fur b/demos/genesis/inside_the_computer.fur
new file mode 100644
index 00000000..b2682019
Binary files /dev/null and b/demos/genesis/inside_the_computer.fur differ
diff --git a/demos/opl/attack_the_barbarian_opl.fur b/demos/opl/attack_the_barbarian_opl.fur
new file mode 100644
index 00000000..f0df49f0
Binary files /dev/null and b/demos/opl/attack_the_barbarian_opl.fur differ