Secret Areas in From the Ashes of Fear:

MAP15:
NOTE: This map has a secret exit to MAP31. To find it you will need to find all of the secret areas in MAP15, and when in each secret area you will need to find the hidden Commander Keen dolls.
1. Leave the room at which you start the map and turn left to see a column. Go around it to the right and look for the differently textured wall. Press on it to enter the secret area.
1a. Once you're in the secret area, ride the elevator and look through the first window. Across the courtyard is a dark window, and if you look closely you will see a Cdr. Keen inside. Shoot it until it's destroyed.
2. After you have picked up the double-barrelled shotgun, take the stairs to the right and follow the corridor to the darkened rooms with computers. At the far end of the second room is a computer wall illuminated by a flickering light. Press on the wall to enter the secret area.
2a. Once you're in the secret area, turn left and go all the way to the end. The jail cell on your left has a hanging Cdr. Keen. Shoot it until it's destroyed.
3. Once you pick up the rocket launcher you will open up areas from which arachnotrons will emerge. The area to the right of the room with the yellow key has a wall in the corner with a different texture. Shoot it to enter the secret area.
3a. Once you have picked up the goodies in the secret area some pillars will lower to release enemies. The pillar near the entrance to the secret area hides a small window behind which is a hanging Cdr. Keen. Shoot it until it's destroyed.
4. If you have destroyed all three Cdr. Keen dolls in the map the door to the secret exit will open. [This exit is next to the regular exit.]

MAP31:
1. In the room where you start the map is an alcove near the window. Look for the differently textured wall, and press it to get the box of shells. You can also access the super-shotgun earlier than you would if you had not found the secret area.
2. As soon as you pick up the chainsaw look for a differently textured wall on your left. Press it to enter the secret area.
3. After you go around the rampart wall of the castle and enter the other side from the moat entrance, you will trigger a trap that releases enemies from behind the walls. In the next room you will pass a pillar with a different texture on the left side. Press it to lower a secret pillar.
4. After you have picked up the red key and entered the area with the circular stairway, take the left side of the stairway. On the left is a differently textured section of wall. Press it to enter the secret area. Follow the passageway to reach the blue key, which grants you access to the secret exit.

Tips for Map 32:
1. In general, try to kill off the enemies that spawn in the central arena before entering new areas. If you try to avoid the enemies in the arena and duck into new areas or the open doorways, the enemies will swarm around them and make it extremely difficult to escape.
2. There is very limited scope for monster in-fighting, so clear each area as you are faced with new enemies.
3. In the fight with the hell knights, stay in the sunken, grassy area and keep moving to reduce the probability of being hit in the back. Use a regular shotgun instead of the double-barreled shotgun, because you won't be fighting at close range (where the DB shotgun has a greater advantage). At the distance you'll be from the enemies, you'll waste ammo and be less accurate with a DB shotgun.
4. In the fight with the revenants, don't make the mistake of backing up through one of the doorways; you'll be trapped with nowhere to hide. Instead, pick up the megasphere and the ammo, hide behind the nearest pillar for as long as possible (to allow most of the revenants to teleport into the arena), then circle-strafe around the group and shoot into them with the DB shotgun from as close a range as possible.
5. [Only applies to UV Skill] In the second fight with the mancubi, drop to their level and quicly duck into the larger area with the pillars. Use the DB Shotgun at close range.
6. In the fight with the arch viles, drop to their level to pick up the plasma rifle, switch to rocket launcher, then run out to pick up the invulnerability sphere. [It's located at a different spot in each skill level - right in front of the plasma rifle for Skills 1/2, nearby and to the left for Skill 3, and in the middle of the circular atrium for Skills 4/5.] Run to the outer, covered ring and blast them with your rocket launcher when they have you surrounded, until you run out of ammo. Staying in the "outdoor" section of the atrium will cause you to be tossed very high by the arch viles, and make it difficult to aim and shoot. The rockets at close range are the key to maximizing damage before the invulnerability effect wears off. Try to get into one of the "alcoves", as this will reduce the height you are tossed.
7. To fight the barons of hell, use the same strategy as suggested in 2, above, for the revenants. Use rockets when appropriate, and a DB shotgun/plasma rifle/chaingun at close range.