The phone app is almost the same as the Nintendo DS one. The Chosen ones guide you to the shortest route, they also take all the treasures.
Dragon Quest IV, V and VI are called the Zenithian Trilogy. The Stairway to Zenithia is in both Dragon Quest IV and V, It’s considered to be the same building because of its similar structure.
DRAGON QUEST V [Route Guidance] #18 Stairway to Zenithia＞https://youtu.be/KiCV81HUW3k
The world of Dragon Quest VI is older than IV era, there is the Pillar of Pegasus that seems to have used the same building technology. The Stairway to Zenithia and the Pillar of Pegasus are partially similar, but the internal structure is different.
In addition, a certain Castle appears in the Zenithian Trilogy, that are very similar in structure and function. Please refer to this video and recommend my channel to your friends.
WACOCA: People, Life, Style.