From my experience playing beginner maps, some advice about guiding the player gently through a map by making choices about textures, flats and so on in your map elements!
www.patreon.com/davidxnewton
00:00 Science
04:05 Doors
06:25 Switches
10:15 Shootable switches
11:10 Bars
13:05 Platforms
14:05 Teleports
15:15 Damaging floors
17:20 New concepts
20:25 Acting on feedback