Week 04 / 09 · Crystal Sensor Cavern

Cave Sentinel

A crystal barrier blocks the tunnel. Scan before moving and show that the scout knows when to stop.

Your robot · Four-legged cave scout

New York
Tutoring Center

Crystal Sensor CavernGrid: C1–C5 · R1–R5
North = decreasing rowDrag to orbit · Scroll to zoom

Your challengeReach C3 R3, record a blocked scan, and confirm a safe stop.

Build your program

Select an insertion slot, then choose a block. Use Up, Down, or Remove to edit.

When Run is clicked

Read the challenge. Make a prediction before you test.

Run trace / test history

How to play & hint

Repeat scan then IF clear: move. After the loop, confirm a stop while the latest scan is blocked.

Camera rotation does not change the robot’s heading. Turns stay on the same tile. Reset returns the robot to its start; your program stays editable.

These are custom Scratch-inspired simulation blocks. This site does not run Scratch projects or control physical hardware.

Explain your thinking

What should happen after the scout scans the barrier?

Predict → build → test → explain → revise. Swap driver and navigator roles after a test.

Game completion is saved on this device. Your teacher also reviews your explanation.