challenge-specific immersive room

Harden collections frequency index

A focused WebXR-ready arena for this mission, with spoken commands, real safe-judge controls, Genie voice coaching, and fallback 3D for normal browsers.

Checkingkeyboard fallbackCODING

Open classic workspace

Booting immersive renderer

Immersive Answer Stream

Checking

Immersive Control Deck

Support status

Checking WebXR support...

Challenge board focused

Say: Read the problem

Say: Give me a hint

Say: Run tests

Rank Signal

Level 5Terminal Rookie

2840

410

Coins

Streak

Latest Checks

Run tests from the control deck or say “Run tests” to populate this panel.

Genie is in VR voice mode. Ask for a short hint, error explanation, or progress readout.

Open Next Challenge

Genie Mentor Core

VR Voice protocol / contextual guardrails active

Progressive hints

Failed-test aware

Solution guarded

Mission: java-hard-collections-frequency0 attempts0 failed tests0 hints used

Progressive hint depth

Genie: Genie online. I use your mission, attempts, failed tests, hints, and path context to coach the next rep without dumping answers first.