This happened in my parents old house when I was like 7.... We lost our cat, when we finally tracked him down, hed found his way into a room in the basement we didn't know existed, didn't even have a door, but the room above it had access under the carpet once you knew where to look (which we found from the hole the cat found to get in there)
Ended up finding an old pitchfork, which my dad still has to this day... and 2-3 wooden baseball bats... lost those in a house fire in '98
It was wild tho, probably as exciting for you, as it was for me when I was only 7.... tho for slightly different reasons I'm sure...
Find a bricked off room w/ a pitchfork and some baseball bats at age 7, you dont think grow room.... you think this rooms prolly haunted as hell, who and why... brick up a room, and a few weapons, and make it look like it don't exist.... ffs I grew up w/ HBO and Cinimax, lol.