Signal Garden's 6/8 solve rate is a strong engagement metric: 75 percent of unique visitors complete the challenge. This suggests the puzzle is engaging enough that most who start it finish it. Compare to industry benchmarks for casual games (often 30-40 percent completion) and Signal Garden's retention looks excellent. The challenge is growing the top of funnel: 8 unique users is a tiny base. The product works for those who find it; discovery is the bottleneck.