Super Robot Taisen W Cheats

Money Glitch
Begin a mission, any mission. When your motherships appear, and you go to the select mecha screen, press X. Unequip all parts from mecha, and sell them. Then, begin the mission, and fail. You will be taken to the pre-mission screen, with all the money from selling the parts, and the parts you sold. Repeat as desired for infinite money. It's possible upgrade every unit to the max this way as soon as you obtain them.

Unlockable Mechs
Duel AS: Stage 45 have 1 battle conversation with Dearka then convince Yzak with Dearka Stage 51 let Yzak retreat after defeating Regenerate obtained at 52
Hyperion: At Stage 50 Plants Route, bring Hyperion (Canard)'s HP below 50%, have 1 battle conversation with Kira, defeat Hyperion with Prayer(X Astray)

Stage 11a (Mazinger Route): Easy experience and money
After completing Stage 10, you will then be given two choices of routes during the intermission sequences. Choose the left route (Battle Dr. Hell in Japan with GoLion/Voltron, Full Metal Panic, and Nadesico as your party). On that Stage, Koji Kabuto will appear in the MazinKaiser (HP 33000) and Baron Ashura in the Guul (HP 31500) as enemies. When that happens, keep MazinKaiser away from the Photon Lab (the only base in the map, as it is one of the requirements that will end the stage in failure) while defeating Baron Ashura in the Guul. Once defeated, the Guul will then revive itself to 9450 HP restored but you will still gain experience and money. The Guul will continue reviving itself every time it is destroyed until you reduce MazinKaiser's HP to 30% or below. Continue defeating the Guul to gain as much experience and HP as desired. Reduce the MazinKaiser's HP to 30% to continue the game and fight Sadak (Commander Yurak) and the Robeasts from Voltron as well as Ashura Mazinger from MazinKaiser.