“Do you play Mr. Heli?” – At the title screen press II, I, II, II, I, SELECT then press RUN.
“Thank You” – At the title screen press II, I, I, II, SELECT then press RUN.
Stage Select – II, I, II, II, I, II, HOLD SELECT then press RUN, Hold down SELECT while on the STAGE SELECT menu to access later stages 4 and above.