Secret Vault is a Discovery quest in Chapter 2, "Covert Ops", of "Episode INTERmission" in Final Fantasy VII Remake Intergrade. While Yuffie Kisaragi and Sonon Kusakabe climb the underground floors of the Shinra Building's Advanced Weaponry development, they open a door to a secret vault on B14. It leads to a reprise of the Whack-a-Box minigame from the base game, specialized for Yuffie, Shinra Box Buster.
Walkthrough[]
After opening the vault doors on floor B14 - Advanced Weaponry: Maintenance in "The Scent of Materia", instead of descending the central tower further, head through the vault and interact with a computer terminal. This opens the Shinra Box Buster challenge, similar to Whack-a-Box from the base game, beginning with basic training.
Basic Training[]
Only Yuffie Kisaragi can compete in the basic training challenge. The following awards are available:
| Target Score | Prize |
|---|---|
| 5000 | An orb of  ATB Assist Materia
|
| 10000 | An orb of  ATB Boost Materia
|
| 20000 | An orb of ATB Stagger Materia
|
Yuffie has to smash several boxes with her Throw, Attack/Ninjutsu and ATB abilities, and gain as many points as possible within the time limit Boxes either yield 100, 200, or 1,500 points, or are timer boxes that add 10 seconds to the clock. The 100-points boxes are weak to physical damage, the 200-points boxes are weak to ninjutsu, and the 1,500 points boxes are especially durable. A couple timer boxes are found behind obscured objects, which must be destroyed with well-timed Throws.
The best strategy to destroy the boxes quickly is to use Throw followed immediately by Retrieve to close the gap between the boxes and attack them quickly. The orange boxes are destroyed by throwing and retrieving or by attacking them when Yuffie is holding her shuriken. The purple boxes are destroyed by throwing Yuffie's weapon onto any box, and using ninjutsu on the purple boxes. Throwing the weapon to a 1,500 pts box and then using Windstorm destroys it in one go. Art of War can also be used against 1,500 pts boxes, or against clusters, and when charged halfway, Banishment can be deployed against 1,500 pts boxes. If you have no ATB when coming up against a 1,500 pts box that needs to be destroyed, use Throw-Retrieve repeatedly. Check corners often for timer boxes and clusters, as these can be beneficial for reaching the top score.
SOLDIER Training[]
After reaching the top score with basic training, SOLDIER training unlocks, with the following awards:
| Target Score | Prize |
|---|---|
| 10000 | An orb of  Magnify Materia
|
| 30000 | An orb of Gil Up Materia
|
| 50000 | An orb of EXP Up Materia
|
SOLDIER Training Course in Shinra Box Buster 50,000 points Final Fantasy VII Remake INTERmission
This challenge is similar to basic training, though there are only 30 seconds and you are required to destroy every box to win the best reward. This makes hitting timer boxes more crucial, as well as using ATB abilities strategically better. It is ideal to use ranged Windstorm against the large boxes, and the cluster of mixed orange and purple boxes, and for the end, fully charge a Banishment. This means it can be unleashed on a cluster of 1,500 boxes appearing in the last room, as a fully-charged Banishment has a wide enough blast radius to destroy them all. Hard to reach boxes can also be destroyed with Banishment. There is a sneaky cluster of boxes to the right from where the player starts, which is easy to miss. There is another "hidden" large box behind the bend after going up a ramp, opposite of two other large boxes.
In a new room full of boxes, you can just use Throw immediately and attack whatever box it happens to land on, rather than try to do the boxes in a specific order. Yuffie always auto-targets something, so just keep throwing her weapon right after destroying a box, and it should find a new box. If it lands on an orange, just Retrieve. If it lands on purple, use ninjutsu, which has a very long range so you do not need to be near the boxes. If it lands on a large box, use Windstorm. If it lands on a large box, but you lack ATB, use ninjutsu on any purple box nearby to build ATB. If a large box is the only target and Yuffie does not have ATB, use Throw+Retrieve over and over on the box. Try not to fret about the timer. The timer boxes get destroyed among targeting the other boxes, and there is enough time to destroy all boxes by the end.
