Insanity is RE9's post-clear difficulty mode — 3x damage multiplier, reduced parry windows, halved healing. These 10 lessons are what separates an 8-hour Insanity completion from a 30-hour grind. Based on community-verified data plus first-hand testing on PS5 and Steam.
Insanity unlocks after clearing the campaign once on any difficulty (including Casual), but jumping straight in from Casual is a brutal mistake. The damage multiplier is approximately 3x, parry windows are reduced by roughly 6 frames per attack, and pustule HP on Phase 2 bosses is roughly doubled. None of these are tutorialized. Do at least one Standard playthrough first to internalize attack patterns. The 8-12 hours you spend on Standard NG+ saves you 30+ hours of Insanity wall-banging.
The default Hatchet's parry window is too tight to react to consistently on Insanity. The Mortal Edge Hatchet — dropped after defeating The Commander in the ARK — has a ~28-frame parry window vs the default's ~18-frame window (per community frame data). On Insanity you cannot reliably parry without it. If your Standard run skipped The Commander, your Insanity run starts with that fight, period.
Infinite Ammo unlocks from the Special Content Store after first clear. It does NOT void any trophies, including Insanity-related ones. Capcom explicitly designed it as a difficulty crutch for Insanity. Equipping Infinite Requiem on Phase 2 of Victor Gideon transforms a 30-minute fight into a 4-minute one because pustule destruction is no longer the bottleneck. This is not cheating — it's intended difficulty scaling.
Insanity's reduced parry window means muscle memory built on Standard might be too late. Best preparation: spend a full Standard NG+ run focused exclusively on parries. By the time you start Insanity, you should be parrying overhead smashes without thinking about it. The overhead smash (Victor Gideon Phase 2) has the most generous Insanity parry window — practice that first.
Three of the trophy chain stack on a single Insanity NG+ run with Infinite Ammo: Speedrunner (clear under 5 hours), Apex Predator (clear Insanity), and Remarkable Agent (clear specific Insanity chapter requirements). Properly planned, one Infinite Ammo Insanity run nets you ~12 hours of trophy progression. Don't do these as separate runs.
Every boss arena in RE9 has a triggered cutscene. On Insanity, where one mistake can be a one-shot, you want to be in a specific position when the cutscene ends — not scrambling. For Victor Gideon: be at center-arena facing the entrance corridor. For Plant 43: be at the rear of the bridge, behind cover. For Mr. X / Super Tyrant: be near the leftmost car. These positions all give you a ~2-second "free move" window before the boss commits to first attack.
On Insanity, ammo respawns through Supply Boxes are roughly halved compared to Standard, but First Aid Sprays are quartered. You will run out of healing before you run out of ammunition. The implication: take less damage by playing more conservatively, not by stockpiling more healing items. If you're using a First Aid Spray more than once per chapter, your positioning is wrong, not your supply chain.
When in doubt on Insanity, retreat and re-evaluate. Standard difficulty rewards aggressive positioning because the 1-shot risk is lower. Insanity flips this — staying alive while you reload, sharpen, or reposition is worth more than the damage you'd deal by pressing forward. The pause menu is your friend. Use it to check your ammunition before committing to a boss combo.
Some bosses (Mr. X / Super Tyrant, Titan Spinner) feel like they require you to stay in their face. On Insanity, the math changes. Even cover-and-burst against a thrown-car-throwing Super Tyrant is faster than dying once and restarting. Identify the cover in each arena before the fight: scrap metal piles for Victor Gideon, the rear ledge for Plant 43, the parked cars for Super Tyrant.
Insanity has no checkpoint forgiveness. Save manually at every Storage Box you pass — not just before bosses. The pattern: every time you collect 3+ items, save. Every time you successfully clear a sub-section, save. Boss-only saving is a beginner mistake on Insanity. The 10 seconds you spend saving prevents the 45 minutes you'd otherwise replay after dying to the next encounter.
Insanity is brutal but not unfair. Players who attempt it without Standard prep, Mortal Edge, or Infinite Ammo will hit walls that feel impossible. Players who run Standard NG+ first, get Mortal Edge from The Commander, and equip Infinite Requiem for Phase 2 of every boss find Insanity becomes a positioning challenge rather than a damage race. The 10 lessons above are what separates 30-hour Insanity grinds from 8-hour Insanity completions.
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