Easter Island (Into the Future)

Easter Island is the 33rd stage in Into the Future.

Reference

 * http://battlecats.spica-net.com/chapfuture1/s04.html
 * http://battlecats.spica-net.com/chapfuture2/s04.html
 * http://battlecats.spica-net.com/chapfuture3/s04.html