Clear on Professional difficulty without using bonus weapons
Primal Knife
The Primal Knife is a unique blade that offers infinite durability when set to specific conditions. It's more powerful than the standard knife and allows you to evade enemy grabs multiple times. This makes it particularly useful for "Minimalist" runs and for tackling higher difficulty levels.
The Chicago Sweeper is actually a submachine gun that provides infinite ammo under certain conditions. It's a crucial item if you're aiming to achieve an S+ rank on Professional difficulty. Be sure to acquire it for your high-ranked runs.
The Handcannon is another submachine gun, which offers unlimited ammo when fully upgraded to its limited edition. It's capable of firing potent Magnum rounds without any limitations. Once you obtain it, consider upgrading it to the limited edition using special modification tickets.
Bonus Weapons can be unlocked in the Extra Shop using Clear Points, which are earned by achieving certain records in the game. Some of these weapons, like the Chicago Sweeper, are essential for successfully completing Professional S+ New Game runs. Make sure you're fully prepared before unlocking them.
Bonus Weapons aren't automatically added to your inventory when you unlock them. Instead, you'll need to retrieve them from storage located at typewriter save points. Don't forget to collect them if you plan to use them during your game.