diff --git a/tests/run.lua b/tests/run.lua
index 07021bb..bb5aee7 100644
--- a/tests/run.lua
+++ b/tests/run.lua
@@ -15,6 +15,7 @@ local Entity = require("entity")
 local Combat = require("combat")
 local Items = require("items")
 local Affixes = require("affixes")
+local Shop = require("shop")
 local Identify = require("identify")
 local Effects = require("effects")
 local Status = require("status")
@@ -26,8 +27,78 @@ local Gen = require("gen.init")
 local Connect = require("gen.connect")
 local Level = require("level")
 local Dungeon = require("dungeon")
+local Builder = require("builder")
 local Serialize = require("serialize")
 local Game = require("game")
+local Progression = require("progression")
+local Spells = require("spells")
+local Abilities = require("abilities")
+local Hazards = require("hazards")
+local Shrines = require("shrines")
+local Classes = require("classes")
+local Skills = require("skills")
+local Crafting = require("crafting")
+local Companions = require("companions")
+local Artifacts = require("artifacts")
+local Bosses = require("bosses")
+local Elites = require("elites")
+local Quests = require("quests")
+local Meta = require("meta")
+local Alchemy = require("alchemy")
+local Resistances = require("resistances")
+local Factions = require("factions")
+local Encumbrance = require("encumbrance")
+local Render = require("render")
+local Terrain = require("terrain")
+local Vaults = require("vaults")
+local Runewords = require("runewords")
+local Atmosphere = require("atmosphere")
+local Stealth = require("stealth")
+local Compendium = require("compendium")
+local Nodes = require("nodes")
+local Sets = require("sets")
+local Mimics = require("mimics")
+local Curses = require("curses")
+local Momentum = require("momentum")
+local Conductivity = require("conductivity")
+local Corpses = require("corpses")
+local Digging = require("digging")
+local Sanity = require("sanity")
+local Hunger = require("hunger")
+local Events = require("events")
+local Graves = require("graves")
+local Proficiency = require("proficiency")
+local Ascension = require("ascension")
+local Durability = require("durability")
+local Disarm = require("disarm")
+local Chests = require("chests")
+local Reanimation = require("reanimation")
+local Secrets = require("secrets")
+local Mercenaries = require("mercenaries")
+local Morgue = require("morgue")
+local Leaderboard = require("leaderboard")
+local Replay = require("replay")
+local Challenges = require("challenges")
+local Analytics = require("analytics")
+local Titles = require("titles")
+local Export = require("export")
+local Streaks = require("streaks")
+local Nemesis = require("nemesis")
+local Biomes = require("biomes")
+local Scavenging = require("scavenging")
+local Infighting = require("infighting")
+local Blocks = require("blocks")
+local SaveGame = require("savegame")
+local Polymorph = require("polymorph")
+local Prefab = require("gen.prefab")
+local Noise = require("noise")
+local Disease = require("disease")
+local Captives = require("captives")
+local Horde = require("horde")
+local Branches = require("branches")
+local Phases = require("phases")
+local Commands = require("commands")
+local Examine = require("examine")
 
 local passed, failed = 0, 0
 local failures = {}
@@ -251,6 +322,123 @@ function tests.generators()
   end
 end
 
+function tests.mazeGeneratorIsDeterministicDiffersAcrossSeedsAndLeavesEveryFloorCellReachable()
+  local m1, reach1 = Gen.build("maze", 60, 24, Rng.new(2024))
+  local m2 = Gen.build("maze", 60, 24, Rng.new(2024))
+  eq(table.concat(m1.tiles), table.concat(m2.tiles), "maze is deterministic")
+  local other = Gen.build("maze", 60, 24, Rng.new(2025))
+  ok(table.concat(m1.tiles) ~= table.concat(other.tiles), "maze differs across seeds")
+  local walkable = 0
+  for y = 1, m1.height do for x = 1, m1.width do if m1:isWalkable(x, y) then walkable = walkable + 1 end end end
+  ok(walkable > 0, "maze carves open floor")
+  eq(#reach1, walkable, "maze leaves every floor cell reachable without gen.connect stitching anything extra")
+end
+
+function tests.mazeGeneratorIsRegisteredButExcludedFromTheDepthCycle()
+  ok(Gen.has("maze"), "maze is a selectable generator")
+  local found = false
+  for _, name in ipairs(Gen.order) do
+    if name == "maze" then found = true end
+  end
+  ok(not found, "maze is deliberately absent from the auto-cycled depth order")
+end
+
+function tests.mazeGeneratorProducesOneWideCorridorsRatherThanOpenRooms()
+  -- Braiding deliberately opens a handful of the diagonal cells a pure
+  -- backtracker never touches (see mazeGeneratorBraidingOpensSomeDeadEnds...
+  -- below), so this checks the unbraided core algorithm's own shape rather
+  -- than the default, braided output.
+  local map = Gen.generators.maze(60, 24, Rng.new(7), { braidNumerator = 0, braidDenominator = 1 })
+  local openTwoByTwoBlocks = 0
+  for y = 2, map.height - 2 do
+    for x = 2, map.width - 2 do
+      if map:isWalkable(x, y) and map:isWalkable(x + 1, y)
+        and map:isWalkable(x, y + 1) and map:isWalkable(x + 1, y + 1) then
+        openTwoByTwoBlocks = openTwoByTwoBlocks + 1
+      end
+    end
+  end
+  eq(openTwoByTwoBlocks, 0, "a maze never opens a 2x2 block of floor the way a room-based generator does")
+end
+
+function tests.mazeGeneratorBraidingOpensSomeDeadEndsWithoutTouchingConnectivity()
+  local braided = Gen.generators.maze(60, 24, Rng.new(3), { braidNumerator = 1, braidDenominator = 1 })
+  local unbraided = Gen.generators.maze(60, 24, Rng.new(3), { braidNumerator = 0, braidDenominator = 1 })
+  local function walkableCount(map)
+    local total = 0
+    for y = 1, map.height do for x = 1, map.width do if map:isWalkable(x, y) then total = total + 1 end end end
+    return total
+  end
+  ok(walkableCount(braided) > walkableCount(unbraided), "raising the braid odds opens strictly more floor")
+  local reachable = Connect.ensure(unbraided, Rng.new(3))
+  eq(#reachable, walkableCount(unbraided), "an unbraided perfect maze is already fully connected on its own")
+end
+
+function tests.prefabVaultSizeMatchesItsWidestRowAndItsRowCount()
+  local vault = { rows = { "####", "#..#", "####" } }
+  local w, h = Prefab.size(vault)
+  eq(w, 4, "size reports the width of a template row")
+  eq(h, 3, "size reports the number of template rows")
+end
+
+function tests.prefabVaultFitsAcceptsAnAnchorWithAWallGapToEveryBorderAndRejectsOneWithout()
+  local map = Map.new(20, 15)
+  local vault = { rows = { "###", "#.#", "###" } }
+  ok(Prefab.fits(map, vault, 2, 2), "an anchor two cells in on every side leaves a wall gap to the border")
+  ok(not Prefab.fits(map, vault, 1, 2), "an anchor flush against the west border is rejected")
+  ok(not Prefab.fits(map, vault, 2, 1), "an anchor flush against the north border is rejected")
+  local w, h = Prefab.size(vault)
+  ok(not Prefab.fits(map, vault, map.width - w + 2, 2), "an anchor that spills past the east border is rejected")
+  ok(not Prefab.fits(map, vault, 2, map.height - h + 2), "an anchor that spills past the south border is rejected")
+end
+
+function tests.prefabVaultStampWritesEveryGlyphAndCollectsTreasureMonsterAndLootMarkersInMapOrder()
+  local map = Map.new(20, 15)
+  local vault = {
+    name = "testVault",
+    rows = {
+      "#####",
+      "#*M+#",
+      "#.L.#",
+      "#####",
+    },
+  }
+  local result = Prefab.stamp(map, vault, 3, 4)
+  eq(result.name, "testVault", "the stamp result remembers the template's own name")
+  eq(map:get(3, 4), Tiles.WALL, "a '#' glyph becomes a wall tile")
+  eq(map:get(4, 5), Tiles.FLOOR, "a '*' treasure marker still becomes walkable floor")
+  eq(map:get(5, 5), Tiles.FLOOR, "an 'M' monster marker still becomes walkable floor")
+  eq(map:get(6, 5), Tiles.DOOR_CLOSED, "a '+' glyph becomes a closed door")
+  eq(map:get(5, 6), Tiles.FLOOR, "an 'L' loot marker still becomes walkable floor")
+  eq(#result.treasure, 1, "exactly one treasure anchor is collected")
+  eq(result.treasure[1].x, 4, "the treasure anchor's x is offset by the stamp's own anchor")
+  eq(result.treasure[1].y, 5, "the treasure anchor's y is offset by the stamp's own anchor")
+  eq(#result.monsters, 1, "exactly one monster anchor is collected")
+  eq(result.monsters[1].x, 5, "the monster anchor's x is offset by the stamp's own anchor")
+  eq(#result.loot, 1, "exactly one loot anchor is collected")
+  eq(result.loot[1].x, 5, "the loot anchor's x is offset by the stamp's own anchor")
+  eq(result.loot[1].y, 6, "the loot anchor's y is offset by the stamp's own anchor")
+end
+
+function tests.prefabVaultStampIsDeterministicForAFixedAnchor()
+  local vault = Prefab.vaults[1]
+  local m1, m2 = Map.new(20, 15), Map.new(20, 15)
+  Prefab.stamp(m1, vault, 3, 3)
+  Prefab.stamp(m2, vault, 3, 3)
+  eq(table.concat(m1.tiles), table.concat(m2.tiles), "stamping the same vault at the same anchor twice is byte-identical")
+end
+
+function tests.builderCanBeExplicitlySteeredToAMazeFloorAndStillYieldsAPlayableLevel()
+  local level = Builder.build(3, Rng.new(11), { generator = "maze" })
+  eq(level.generator, "maze", "the level remembers it was built with the maze generator")
+  eq(level.map:get(level.upX, level.upY), Tiles.STAIRS_UP, "a maze floor still gets its up stairs")
+  eq(level.map:get(level.downX, level.downY), Tiles.STAIRS_DOWN, "a maze floor still gets its down stairs")
+  local path = Astar.find(level.map, level.upX, level.upY, level.downX, level.downY, function(x, y)
+    return not level.map:isPassable(x, y, true)
+  end)
+  ok(path ~= nil, "the down stairs are reachable from the up stairs on a maze floor")
+end
+
 function tests.connectivityRepair()
   local map = Map.new(15, 7)
   for y = 2, 4 do for x = 2, 4 do map:set(x, y, Map.FLOOR) end end