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Sometimes the portal can block your way, making the other side of the level inaccessible.
When opening the portal, be sure that every other enemy in the level is dead, or else they won’t count towards your kill count. Horrors rad beam can help fill it up faster. Plutonium hunger may help with this process. You may have to bait enemies closer to the statue in order to bait them in. A weapon like the super plasma cannon can easily break this. Do NOT hit the vault with a heavy hitting weapon. At 80 HP left, the center will break and you can bait enemies towards it. They appear on 3-2 and 5-2 on preloop, while on loop they appear on 1-2, 3-2, 5-2 and 7-2. You may only enter vaults 3 times total, afterwards they will no longer spawn. Entering it will get you crowns, and a nice difficulty increase, and some cool crowns. You must break the center open, kill enemies around it to fill it with rads, then break it. Vaults are a temporary way of increasing difficulty. If you kill every enemy quick enough while in pizza sewers, the portal can spawn before the cops drop out of the idpd van, saving you from a possible deadly elite confrontation, but you will miss out on those few extra kills. If you don’t have an explosive weapon on loop, you can try to bait the idpd to throw a grenade at you, and use a melee weapon to knock the grenade within range of the manhole. Chicken and Eyes can carry other weapons through portals, so if you find an explosive weapon in the desert, bring it along with you!. Rogue’s portal strike and blast armor can both blow up the manhole. The manhole can spawn underneath chests, and it’s barely bigger then them, so look carefully if you cannot see it at first. If the floor is fully tiled, there is a chance the manhole may not appear. Any explosive weapon works, besides jackhammer, blood weapons, melting blowing up corpses, and fire weapons. Pizza sewers is reached through blowing up the manhole on 2-1(If loop, you must kill mom before you can blow it open.) It is one of the easiest places in the game to reach, and is a nice difficulty boost and some small padding to your kill count. At the very least, I urge you to read the Police HQ category, as it is really what matters the most when it comes to kills! Pizza Sewers The guide is split up into all the different areas, with lengthy tips to make sure you’re doing it the most efficiently as possible. This is why secret areas are vital, as though there are few of them getting through them sooner will help beef up your kill count, and get you the most impressive score! This makes more enemies spawn in each level, but also makes better weapons appear sooner. Every time you enter a portal, the difficulty goes up by one. This guide will include spoilers for the entirety of the game.