PTI maps made by RectorRocks.

Branding image : PTI banner image.

Background image : Portal 2 waterfall wallpaper.

Difficulties:
1/10: Very Easy
2/10: Very Easy-Easy
3/10: Easy
4/10: Easy-Medium
5/10: Medium
6/10: Medium-Intermediate
7/10: Intermediate
8/10: Hard
9/10: Hard-Very Hard
10/10: Very Hard
HUH/10: Illogical
?/10: Unidentified

List of maps :
1) Turrets' Ceiling Buttons
Remarks: First PTI map
Puzzle: Momentum, kill-the-turret, strategic ledge
Difficulty: 8/10, HUH/10 (Hard, Illogical)
Rating: ★ ★ ★ ☆ ☆ (26 ratings, 13 ⇧ 13 ⇩)

2) Not Enough Lasers
Remarks: Classic laser map, with sarcasm in the title
Puzzle: Frankenturret trust, block-the-laser, laser relay, momentum
Difficulty: 5/10 (Medium)
Rating: ★ ★ ★ ★ ☆ (127 ratings, 107 ⇧ 20 ⇩)

3) Funnel Grating
Remarks: Watching companion cubes dropping into the Goo continuously is miserable
Puzzle: Transferal of cubes through gratings
Difficulty: 4/10 (Easy-Medium)
Rating: ★ ★ ★ ★ ☆ (45 ratings, 41 ⇧ 4 ⇩)

4) Companionship
Remarks: First map to be in the 1st page of the Steam Workshop in the category "Most Popular (This Week)" and have 5 stars
Puzzle: Drop-the-cube, Speed gel momentum, flinging, mini-game
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ★ (541 ratings, 494 ⇧ 47 ⇩)

5) Mixture of Chambers
Remarks: First map to be in the Steam Workshop Spotlight (Map shown in the Portal 2 library and Overall Workshop page)
Puzzle: Maze, laser relay-laser platform, funnel cube grab, momentum, flip panels backtracking, simple laser
Difficulty: 7/10 (Intermediate)
Rating: ★ ★ ★ ★ ★ (3113 ratings, 2939 ⇧ 174 ⇩)

6) Laser Communication Network
Remarks: First fizzler-network map, name derived from Doom 3 level "Communicatons"
Puzzle: Fizzler-network, laser
Difficulty: 5/10 (Medium)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 17 ⇧ 3 ⇩)

7) Handle with Care
Remarks: Flooded test chamber, idea from Lpfreaky90 and msleeper for creating a flooded test chamber
Puzzle: Bridge-funnel strategy
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ☆ ☆ (41 ratings, 31 ⇧ 10 ⇩)

8) A Step to Success
Remarks: First crusher map
Puzzle: Block-the-water, speed gel crusher, laser-platform
Difficulty: 6/10 (Medium-Intermediate)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 16 ⇧ 2 ⇩)

9) Talent Show
Remarks: First map using the timing mechanic
Puzzle: Funnel momentum, speed & bounce gel combination
Difficulty: 4/10 (Easy-Medium)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 14 ⇧ 4 ⇩)

10) Bridge the Laser
Remarks: Remake of Chapter 3's Test Chamber 17 and several other maps
Puzzle: Block-the-laser, pull-the-rug, danger standing
Difficulty: 5/10 (Medium)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 16 ⇧ 3 ⇩)

11) Deep Underground
Remarks: First underground Style Mod map, Workshop spotlight
Puzzle: Paint fizzler, crazy box, laser relay-laser platform, grab-the-cube, remove-the-cube, speed gel ramp
Difficulty: 7/10 (Intermediate)
Rating: ★ ★ ★ ★ ★ (908 ratings, 783 ⇧ 125 ⇩)

12) The Heights
Remarks: First clean Style Mod map, name derived from Def Jam Fight: For NY map "The Heights"
Puzzle: Bridge-the-catcher, aim the laser, momentum
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ☆ (233 ratings, 207 ⇧ 26 ⇩)

13) Simple Bridging
Remarks: Classic button betrayal map
Puzzle: Button betrayal, momentum
Difficulty: 5/10 (Medium)
Rating: ★ ★ ★ ☆ ☆ (34 ratings, 29 ⇧ 5 ⇩)

14) Three Connective Rooms
Remarks: Part of puzzle idea from Testing for Fun
Puzzle: High catcher, confusing grate, overlooking fizzler
Difficulty: 6/10 (Medium-Intermediate)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 14 ⇧ 4 ⇩)

15) Try Harder
Remarks: First hard execution map
Puzzle: Momentum, drop-the-cube, move-the-platform
Difficulty: 7/10 (Intermediate)
Rating: ☆ ☆ ☆ ☆ ☆ (Not enough ratings, 16 ⇧ 4 ⇩)

16) Four Way Road Split
Remarks: Classic split map
Puzzle: Laser relay-laser platform, bounce gel, frankenturret trust, block-the-laser, catch-the-cube
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ☆ (226 ratings, 203 ⇧ 23 ⇩)

17) Hazardous Air
Remarks: Name derived from the 2013 Southeast Asian haze affecting Singapore during this period of time
Puzzle: Momentum, laser relay, bring-the-cube, mini-game
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ☆ (29 ratings, 28 ⇧ 1 ⇩)

18) Longest
Remarks: Name derived from Halo: Combat Evolved map "Longest"
Puzzle: Speed gel ramp, speed & bounce gel combination, conversion gel & water combination, conversion gel, strategic laser, laser-platform
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ☆ (65 ratings, 55 ⇧ 10 ⇩)

19) Reminiscence
Remarks: First Portal 1 styled chamber, first map to be featured in a Coopcrowd's livestream! Thanks Wills! :D (Link to Wills' livestream: http://www.twitch.tv/coopcrowd/b/435179238) See 0:53:16 for the map playthrough.
Puzzle: Block-the-turret, kill-the-turret, stacking cubes, momentum
Difficulty: 7/10 (Intermediate)
Rating: ★ ★ ★ ☆ ☆ (35 ratings, 28 ⇧ 7 ⇩)

20) Wrecking Ball
Remarks: Classic fizzler-network map, name derived from Miley Cyrus' song "Wrecking Ball"
Puzzle: Fizzler-network, laser
Difficulty: 7/10 (Intermediate)
Rating: ★ ★ ★ ★ ☆ (192 ratings, 179 ⇧ 13 ⇩)

21) Beginner's Journey
Remarks: First map to use the Lifeform Sensor and High-Energy Pellet
Puzzle: No portal-gun, basic Lifeform-sensor, pellet controllers, precise aiming, funnel reversal, block-the-path, strategic laser, spawn-momentum
Difficulty: 6/10 (Medium-Intermediate)
Rating: ★ ★ ★ ★ ☆ (63 ratings, 48 ⇧ 15 ⇩)

22) Light Trend
Remarks: First map to have puzzles entirely by another contributor, Sovereign.
Puzzle: Block-the-cube, flinging momentum, funnel reversal, timer
Difficulty: 4/10 (Easy-Medium)
Rating: ★ ★ ★ ★ ☆ (41 ratings, 37 ⇧ 4 ⇩)

23) Glass Conundrum
Remarks: Classic glass maze puzzle with a simple laser puzzle
Puzzle: Glass-maze, bridge-the-gap, piston platform, free-kill turret
Difficulty: 3/10 (Easy)
Rating: ★ ★ ★ ★ ★ (786 ratings, 718 ⇧ 68 ⇩)