A complete list—so far as I know—of Lefler's Laws. It includes those from "The Game", New Frontier novels, a DC Special, and the fan-production Hidden Frontier.

1. You can only count on yourself.^{("The Game")}
7. Never reveal more than you have to.^(HF:3.08)
12. Execution is nine-tenths of the job.^{(1995 DC Special)}
12. Give credit where credit is due.^(HF:1.03)
17. When all else fails, do it yourself.^{("The Game")}
22. Never date a co-worker.^(HF:1.02)
23. Never look back, the obstacles are all ahead.^(HF:1.03)
29. Always make time for friends.^(HF:1.03)
32. If life hands you lemonade, don't try to make lemons out of it.^{(Fire on High, p.20)}
36. You gotta go with what works.^{("The Game")}
42. Any joke that has to be explained isn't worth explaining.^{(Treason, p.62)}
43. Never underestimate the power of teamwork.^(HF:1.06)
46. Life isn't always fair.^{("The Game")}
52. Never underestimate a man's ability to make you laugh.^{(Martyr, p.143)}
56. A little elbow grease never hurt anyone.^(HF:1.06)
65. Never second-guess your own work.^(HF:1.06)
83. Whenever you've eliminated the impossible, whatever remains, however improbable, must be the truth.^{(End Game, p.125)}
91. Always watch your back.^{("The Game")}
97. It always pays to think ahead.^(HF:1.03)
98. Anything can happen.^(HF:1.03)
103. A couple of light years can't keep good friends apart.^{("The Game")}
108. It's not over until it's over, and sometimes not even then.^{(Fire on High, p.105)}
116. When someone is trying to kill you, it's okay to sweat.^{(1995 DC Special)}
117. Never send a Klingon a Tribble.^{(1995 DC Special)}
123. If it works perfectly, someone will re-design it.^(HF:1.02)
125. Getting information out of Zak Kebron is like interrogating a statue.^{(Into the Void, p.41)}