an open pit
^ an arrow trap
^ a covered pit
^ a trap door
^ a gas trap (sleeping gas)
; a loose rock
^ a dart trap (strength)
^ a strange rune (teleport)
^ some loose rock
^ a gas trap (corroding)
^ a strange rune (summon)
^ a blackened spot (fire)
^ some corroded rock (acid)
^ a gas trap (poison)
^ a gas trap (blinding)
^ a gas trap (confuse)
^ a dart trap (slow)
^ a dart trap (constitution)
^ a strange rune (special)