It is a recreation of what it was like to play Fortnite back in its heyday. A mixture of pleasant park, tilted towers, and other locations. Although you'll find items which are from later seasons, the idea is to strip out the nonsense which has crept into the later seasons, so no combat shotguns, P90s or mechas.
To obtain weapons, you press the buttons by the markers for a randomized loadout. Materials are limited to maximum of 200, there is health and material siphon, and you cannot destroy/farm the pre-built areas.