I don't know how many people here have/play Lemmings 3D anymore, but I figured I might as well post my best scores. Feel free to try and beat them if you think you've found a better solution.
(B) = Backroute
Fun
1 -- Take a Dive: 79/80
2 -- That's Right: 79/80
3 -- The Bean Machine: 29/30
4 -- It's A Run Around: 19/20
5 -- Bounce Bounce: 23/30
6 -- It's A Blast: 36/40
7 -- Candyland Climber: 5/6
8 -- Lemmings Inside: 38/40 (B)
9 -- A Short Cut Through the Forest: 75/80
10 -- Castle Lemalot: 18/20
11 -- It's A Classic: 71/80
12 -- Alpine Assault Course: 74/80
13 -- Tower of Stone: 20/40
14 -- Slippery Maze: 72/80
15 -- The M-A-Z-E: 36/40
16 -- Down The Middle We Go!: 76/80
17 -- Hole In Ten: 10/10
18 -- Corkscrew Digger: 67/80 (Probably beatable)
19 -- Attack Of The Fifty Ft Lemmings: 70/80
20 -- Alilemm's: 26/30
Tricky
21 -- Jelly Climber: 8/10
22 -- Which Exit ?: 38/40
23 -- This Is The Army: 29/30
24 -- Fore!: 27/30
25 -- Breakout: 76/80
26 -- Lemmhanger: 18/20
27 -- Follow The Yellow Brick Road: 33/40
28 -- All Around The Watchtower: 78/80
29 -- Land Ahoy: 34/40
30 -- Tooten Lemming: 33/40
31 -- A Head Above The Rest: 31/40
32 -- Dot To Dot: 74/80 (B)
33 -- Shadow Maze: 34/40
34 -- Oh No! More Pyramids!: 76/80
35 -- Chocolate Drop: 75/80 (B)
36 -- Lemlab: 37/40
37 -- Garden Maze: 35/40
38 -- Play Time: 70/80
39 -- Stilt Walkers: 56/60
40 -- King Coder's Tomb: 55/60
Taxing
41 -- Spaghetti Junction: 74/80
42 -- Picky Platform: 73/80 (B)
43 -- Let The Race Begin: 72/80
44 -- Poles Apart: 79/80
45 -- 3D - A Lemming Odyssey: 69/80
46 -- Ricochet: 36/40
47 -- If The Timing Is Right!: 75/80
48 -- Rescue Team: 71/80
49 -- Which Trampoline: 74/80
50 -- It's The Name Of The Game: 77/80
51 -- Chaos Maze: 75/80 (77/80 may be possible via another route; I haven't checked)
52 -- Team Work: 79/80
53 -- Motherboard: 77/80
54 -- Away Team: 75/80
55 -- Birthday Cake: 20/20
56 -- The Arena: 48/50
57 -- T Minus Five And Counting: 40/40 (B)
58 -- Snake: 55/80
59 -- Lemmtris: 80/80
60 -- Death Slide: 39/40 (B)
Mayhem
61 -- The Five Arches: 38/40
62 -- Brechin's Staircase: 55/60
63 -- Tower Of Lemlab: 77/80 (B)
64 -- Ski Jump: 17/20
65 -- The Prisoner: 17/20
66 -- Family Tree: 70/80 Edit: 73/80!
67 -- Driving Range: 77/80 (B)
68 -- Five Towers: 38/40
69 -- Over The Top: 78/80
70 -- The Hanger: 75/80 (Hint: A 68 release rate is your friend on this one!)
71 -- Across The Network: 77/80 (B)
72 -- Raiders Of The Lost Lemming: 33/40
73 -- The Catacombs: 63/80
74 -- Jelly Belly Islands: 38/40
75 -- Hole In One, Two, Three!: 40/40
76 -- Fun Fair: 34/40
77 -- Critical Path: 19/20
78 -- Castle Peralus: 30/30 (B)
79 -- Tuther Circus Level: 79/80
80 -- Final Maze: 37/40 (B)
A couple of these scores (e.g. Fun 8) take advantage of the fact that you can begin a bridge immediately after deflecting off of a turner (without walking to the beginning of the next block). This is difficult to pull off, but possible.
