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The Basics:
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Start a new playthrough with the Jailbreak frame, the starter internal components (BST-G1/P10 booster, FCS-G1/P01 FCS, AG-J-098 JOSO generator) and no weapons.
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For every mission completed, roll for parts depending on which stage of the run you are in. I highly recommend using the dedicated webapp: https://ac6-roguelike-challenge.com/ This website also automatically tracks owned parts and allows you to manually track completed challenges.
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In the event the website is down, use a random number generator and/or dice to roll on the appropriate tables in the "Drop Chances and Stages" and "Parts by Tier" sheets. The latter sheet also has checkboxes that can help you keep track of owned parts, notably the ones you can't remove from your inventory.
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If you don't like your reward, you may reroll once (use the "Revert" button in the webapp to undo the roll), but you must accept the new roll.
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If you fail a mission for any reason, the run is over - start over from the first missions with the crummy Jailbreak setup.
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Optional starting weapon rule:
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If you find it too difficult, annoying or just boring to start every run with only your fists, you may roll for a random Stage 1 weapon to start the challenge with (if using the webapp, use the "Revert" button to undo any rolls that don't give you weapons).
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OS Tuning:
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Start with no OS Tuning upgrades. After every 2 completed missions, you may buy an upgrade of your choice from the list.
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Alternate roguelite rules for OST:
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For every completed stage, note 1 OST Chip acquired. Upon dying and resetting your run, you may spend acquired chips to gain the chosen upgrades permanently.
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Optional challenges:
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Every mission has an optional challenge assigned to it, which usually involves defeating optional encounters and/or completing the mission with limited resources. If you complete a given mission's challenge you may roll twice and add both parts to your item pool. You can't reroll parts if you get two rolls. Challenges can only be completed once per mission per run (for example, in a 3-playthrough run, you will do the mission "Destroy Artillery Installations" 3 times, but you may only cash in on the challenge once).
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Special rules provisions:
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Due to the fact that the Stun Needle is de facto a mandatory weapon for "Destroy the Ice Worm", you may use it for this mission (R-Back Unit variant, as in the base game) even if you haven't acquired it through random rewards.
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You don't need to do the "Illegal Entry" mission - your AC is preset anyways, it's against the point of the challenge.
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However, you will need to do the "Escape" mission if you're not using mission replay for the run - in this case, give yourself an extra Stage 5 reward roll for completing it.
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