A.C.E. Another Century's Episode are Point Gain Trick
Added 2 Feb 2011, ID #3566
There is a glitch in the game that allows you to instantly gain the maximum amounts of ace points and skill points, and this trick can be done at both the mech upgrade menu and the pilot upgrade menu.
First of all, get enough points so at least one upgrade can be potentially purchased (but don't actually buy it yet). Next, make sure that the next upgrade (in either the same category or a different category) will raise the total cost beyond the currently available amount of points (if you press Right again, but don't do so yet until the next step).
Now, the trick here is to press RIGHT and CIRCLE together at the same time, so you request to purchase the upgrades just as the cost value rises past the available amount of points. If you do this trick correctly, the yes-no prompt will calculate a negative amount of remaining points. Choose yes, and notice how your current points will loop around to an incorrect number. Return to the previous menu in order to refresh the point value, and it will now read 99999999 points.
(Again, you must first have enough points to potentially purchase at least one upgrade, otherwise the yes-no prompt won't appear when you press RIGHT and CIRCLE together.
These are ALL on the Easy difficulty and are graded by time elapsed. No upgrades are carried over on either unit or pilot.
Unlock Hyaku Shiki Challenge: Beat the game once and play the Zeta Route to at least stage 5. In this mission you fight Hambrabis in the Space Elevator. Note: being hit by the automatic defenses is an instant death.
Unlock Series Rush Mission: Beat the game once and then 'Continue' with your cleared saved file into a new game where you fight almost ALL the enemies and bosses from series one onwards.