Hidden Margin
Recover six redacted records using the page margins. They form three straight strips of lengths 3, 2 and 1; different strips never touch, even diagonally. The row and column margins count records still hidden in each line. Tap in Recover mode to test a cell. A hit reveals a record and updates both margins; three wrong recoveries end the audit. You have two Sonar scans: choose Scan, then a cell to count records in the 2×2 square whose upper-left corner you tapped (clipped at the page edge). Sonar reports only a count, not which cells contain records. Scan notes stay visible. Use empty margins and strip geometry before spending a guess.
About this experiment
Recover six redacted records using the page margins. They form three straight strips of lengths 3, 2 and 1; different strips never touch, even diagonally. The row and column margins count records still hidden in each line. Tap in Recover mode to test a cell. A hit reveals a record and updates both margins; three wrong recoveries end the audit. You have two Sonar scans: choose Scan, then a cell to count records in the 2×2 square whose upper-left corner you tapped (clipped at the page edge). Sonar reports only a count, not which cells contain records. Scan notes stay visible. Use empty margins and strip geometry before spending a guess. Keyboard: Tab and Enter/Space operate buttons; R restarts.