diff --git a/source/engine/mrbffi.c b/source/engine/mrbffi.c
new file mode 100644
index 0000000..8160949
--- /dev/null
+++ b/source/engine/mrbffi.c
@@ -0,0 +1,35 @@
+#include "mrbffi.h"
+
+#include "mruby.h"
+#include "mruby/compile.h"
+
+#include "script.h"
+
+extern mrb_state *mrb;
+
+int fib(int n) {
+    if (n < 2) return n;
+
+    return fib(n-1) + fib(n-2);
+}
+
+/* FFI */
+
+mrb_value mrb_fib(mrb_state *mrb, mrb_value self) {
+    int n;
+    mrb_get_args(mrb, "i", &n);
+    return mrb_fixnum_value(fib(n));
+}
+
+mrb_value mrb_load(mrb_state *mrb, mrb_value self) {
+    char *path;
+    mrb_get_args(mrb, "z!", &path);
+    script_dofile(path);
+    return self;
+}
+
+void ffi_load() {
+    mrb_define_method(mrb, mrb->object_class, "fib", mrb_fib, MRB_ARGS_REQ(1));
+    mrb_define_method(mrb, mrb->object_class, "load", mrb_load, MRB_ARGS_REQ(1));
+}
+
diff --git a/source/engine/mrbffi.h b/source/engine/mrbffi.h
new file mode 100644
index 0000000..0b2e9dd
--- /dev/null
+++ b/source/engine/mrbffi.h
@@ -0,0 +1,6 @@
+#ifndef MRBFFI_H
+#define MRBFFI_H
+
+void ffi_load();
+
+#endif
\ No newline at end of file