zenless zone zero
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In Joint Investigation, you conduct an investigation together with two other Proxies.
To start the investigation, select your preferred area and stage. You may also select at the same time your desired difficulty (Standard, High Risk, or Nightmare).
After selecting a stage, press "Start Matching" to match with other Proxies who have selected the same stage. You can also invite other Proxies to match via Friends > Outpost.
Upon completing a Joint Investigation, Proxy contribution will be given based on the Chain Meter contribution, the number of times key actions are completed, and DMG dealt by the Agent.

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The Standard investigation is an investigation stage featuring area progression with various types of area gameplay and thematic content. The stage culminates in a showdown with three different powerful enemies;
In a High Risk investigation, the Proxy has to challenge the powerful enemies from the Standard investigation; and
In Nightmare investigations, the Proxy has to face off against Notorious-rank enemies.

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The probability of obtaining Resonium and Gear from Mini Cargo Trucks differs by investigation area:
· In Breaking Thunder at Standard/High Risk difficulty, Mini Cargo Trucks have a higher chance of dropping Slot 1 Resonia;
· In Joyful Blaze at Standard/High Risk difficulty, Mini Cargo Trucks have a higher chance of dropping Slot 2 Resonia;
· In Pale Breath at Standard/High Risk difficulty, Mini Cargo Trucks have a higher chance of dropping Slot 3 Resonia; and
· In Final Battle at High Risk difficulty, Mini Cargo Trucks have a higher chance of dropping Gear!

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When playing on Nightmare difficulty, the Proxy will have a time limit for the challenge, and will also need a higher Investigation Rating to tackle the Nightmare encounter.
Complete all challenges on Nightmare difficulty and you get Thin Line of Reality as your reward!