How to Unlock the Chest in Shinra Building on "Final Fantasy 7" for PS1by Alex Zang ; Updated September 22, 2017
Cloud, the lead character in "Final Fantasy 7," is tasked with tracking down the dangerous Sephiroth -- a powerful ex-soldier who's attempting to destroy the world. Early in the journey, Cloud and his allies must climb the Shinra building. To successfully complete the tower, you'll need to find several keycards to open doors. One of these keycards is in a locked chest on the 65th floor. After recovering this keycard, you can continue up the tower.
Enter the 65th floor of the Shinra building. You'll see several rooms containing treasure chests surrounding the main room, which features a model of Midgar, a city on the eastern continent of the game world where "Final Fantasy 7" is set. Each chest contains one of the Midgar parts to be placed in the model. After placing the part in the model, another chest that also contains a Midgar part opens. After finishing the model, the locked chest near the stairwell opens.
Pick up the Midgar part from the bottom chest relative to the other chests in the middle left room. Walk up to the model of Midgar and place the part by pressing "O."
Open the lower chest in the lower left room. Pick up the part and place it in the Midgar model.
Open the chest in the top right room. Pick up the Midgar part and place it in the model.
Open the chest in the middle left room. Pick up the parts and then place them in the Midgar model.
Open the remaining chest in the bottom left room, then place the part in the last open area of the Midgar model; a "click" sound is heard and the locked chest near the stairwell opens.