Stage Four starts off over another Western Town.. look carefully though at the start and you will be able to make out this little Cinema.. Shoot the Screen! (Better than chucking popcorn eh?)

Here's a nice little In-joke from Taito. If you look REALLY
closely at the cinema screen though you may make out a
couple of interesting 'trailers'.. For Taito's Elevator Action
and something called 'Darius Part 22'!! Hehe.. Nice one..

Moving into the desert.. complete with prolific
ancient crashed spaceship remains. Hmm..
Call Indiana Jones!

This bit is a pain in the arse... caught in midlle of a ring of
rotating enemy planes which shoot bullets inwards at you,
forcing you to dodge like a maniac

End of the level and this boss warps in from a big
spinny black-hole arrangement. Go away!

Missed! Over ere mate.. on the head.. Annoyingly those spinny
things suck your ship in so avoid them if you can.. I guess
you could say they suck?