Chronological levels in Normal Shareware:
E1A1 - The HUNT Begins
E1A2 - Foggy Mountain
E1A3 - The Fourth Door (secret exit to secret level)
E1A8 - Wall to Wall (secret level)
E1A4 - Dark Tunnels
E1A5 - Metal Threat
E1A6 - Ride 'em, Cowboy!
E1A7 - Boom Boom Boom
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E2A1 - Too Tall (warp only level)
E2A2 - Play Room (warp only level but accessible from E2A1)

Chronological levels in Deluxe Shareware:
E1A1 - The HUNT Begins
E2A3 - Prelude to a Kill (deluxe exclusive)
E2A4 - Jumpin' Jehoshaphat (deluxe exclusive)
E2A5 - GADZOOKS! (deluxe exclusive)
E1A2 - Foggy Mountain
E1A3 - The Fourth Door (secret exit to secret level)
E1A8 - Wall to Wall (secret level)
E1A4 - Dark Tunnels
E1A5 - Metal Threat
E1A6 - Ride 'em, Cowboy!
E1A7 - Boom Boom Boom
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E2A1 - Too Tall (warp only level)
E2A2 - Play Room (warp only level but accessible from E2A1)

Chronological levels in Dark War:
E1A1 - In the Thick of It
E1A2 - Winding Way
E1A3 - Burned and Amazed (secret exit to secret level)
E1A8 - Turn of the Screw (secret level)
E1A4 - Too Much Room
E1A5 - Two-Key Return
E1A6 - Spring Surprise
E1A7 - General Darian (boss level)
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E2A1 - Into the Castle
E2A2 - Great Halls of Fire
E2A3 - The Room
E2A4 - Spiralling In
E2A5 - Rocky Plateau (secret exit to secret level)
E2A8 - Elevator Trouble (secret level)
E2A6 - The Four-Way Chamber
E2A7 - Sebastian Krist (boss level)
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E3A1 - Robotricks
E3A2 - Down & Over
E3A3 - Dead in Five Seconds
E3A4 - Clear & Present Dangers
E3A5 - The Angry Quilt
E3A6 - Movin' Walls (secret exit to secret level)
E3A8 - Eight Ways to Hell (secret level)
E3A7 - Know Thine NME (boss level)
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E4A1 - "Monkey" Business
E4A2 - Fire and Brimstone
E4A3 - Crushing Defeat
E4A4 - Diamonds & Rust (secret exit to secret level)
E4A8 - Switched Around (secret level)
E4A5 - Backfire
E4A6 - Circles of Fire
E4A7 - Lair of El Oscuro (boss level)
E4A9 - Canyon Chase
E4A10 - In the Dark Nest (boss level)
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E4A11 - Dead in Two Seconds (warp only level)
E4A12 - The Vomitorium (warp only level but accessible from E4A11)
E4A13 - This Causes an Error! (warp only level)