labyrinth, minefield, thicket, warren, byzantine, cobweb, rabbit warren, serpentine, passageways, zigzags, tangle, jumble, netherworld, archway, wonderland, murk, spelunk, morass, gantlet, puzzles, quicksand, dungeon, scavenger hunt, staircases, riddles, traverse, pathways, spiral staircase, meandering, spider web, alleyways, complex, spiderweb, cavelike, funhouse, dreamscape, rabbit hole, mounds, jungle, walkways, convolutions, doorways, wiggly, tunnels, sarcophaguses, myriad, gameboard, muddle, stairways, octagons, alleys, parallelograms, cavern, goblin, treasure hunt, jungle gym, interstices, cones, abysses, rube goldberg, limbos, contraptions, pyramids, mousehole, glowworm, chasms, haystacks, roller coaster, spiderwebs, scurry, monsters, patchwork quilt, switchback, courtyards, moonlike, kafkaesque, kaleidoscope, spaghetti junction, latticework, wend, fantasyland, polyhedrons, hopscotch, spiderlike, toadstool, alcoves, anthills, beanstalk, hallways, dreamscapes, bestiary, phantoms, wormholes, batlike, belays, piles, hayride, webs, acrophobic, quagmire, nutshells, weave, mazes, labyrinths, welter, tangles, skein, web, enigma, hothouse, iceberg, jigsaw, riddle, whirlpool, babel, gauntlet, knot, maelstrom, stimulation, operant, choice, tachistoscopic, vivo, acquisition, administration, problemsolving, response, simulated, solving, testing, aversive, dichotic, auditory, bimanual, discriminative, errorless, foraging, inhibition

defined, race

system, unit