[
  { "level": "l1-double-tap", "shortest": 10, "neverRule": "DEATHRATTLE IS DOUBLE" },
  { "level": "l2-spliced-corpse", "shortest": 4 },
  { "level": "l3-simultaneous-paradox", "shortest": 6, "naiveUnsolvable": true },
  { "level": "l4-crossed-out", "shortest": 7, "neverRule": "DEATHRATTLE IS DOUBLE" },
  { "level": "l5-sealed-keg", "shortest": 6, "neverRule": "KEG IS NOT KEG" },
  { "level": "l6-melt-before-defeat", "shortest": 7, "neverRule": "LAVA IS HOT" },
  { "level": "l7-clay-key", "shortest": 9, "neverRule": "SHARD IS OPEN" },
  { "level": "l8-nothing-dies", "shortest": 4, "neverRule": "SHARD IS WIN" },
  { "level": "l9-skull-river", "shortest": 9, "neverRule": "SKULL IS SINK" },
  { "level": "l10-friendly-fire", "shortest": 6, "neverRule": "KNIGHT IS YOU" }
]