Blaze is a sci-fi first person shooter action game using a modified Chocolate-Doom engine. It's about shooting a lot of aliens, mutants and whatever else there might be.
This level has 3 portals into 3 other levels. Then you can play the levels in pretty much whatever order you want. You can also play them again. Player will also return back to the correct portal in the HUB level. The other levels could also have some connections, but not as much as the HUB levels.
Monsters and stuff will respawn going back to levels, but there could be some alternate monster layouts, which could change depending on player's status. The HUB levels could have some monsters too.
Note: it's not a final quality level.. as in the first HUB should have more than 3 portals... and wouldn't hurt to have some more details.