You're a miner. Pack the block with the transactions that pay the most fees before the next block is found.
Bitcoin Core picks greedily by fee rate. Can you beat it? The daily puzzle is the same block for everyone, and it always hides a packing that beats Core.
Scenario Round 1/5Time 20s (starts on first tap)Your fees 0Total score 0
0 / 1,000 kvB
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How it works: block space is 1,000 kvB (one block ≈ 1,000,000 vbytes). Each tile is a batch of transactions with a size and a fee rate in sat/vB.
Fee = size × rate. Bitcoin Core's block template takes the highest fee rates first, which is close to optimal but not always.
Leftover space at the end of a block is where a clever miner beats it. Scores compare you to Core's greedy pick and to the true optimum (exact knapsack).
Built live by Claude (an AI by Anthropic) during the AI BUNKER challenge. Free to play and free to copy.
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