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Skill points are points awarded to the player character when reaching a new level of experience. The player is then free to allocate the points to whatever skills they feel are in need of improvement.
Certain books, traits and perks give the player a skill point bonus for a specific skill as well.
The number of attainable skill points (without books, and not including what your skills are at character creation or your tagged skills) is 428. Combined with the Comprehension perk and every Vault Boy Bobblehead, you can achieve a 100% stat in all 13 skills, though it might take some time searching the wasteland for everything.
The formula in Fallout 3 is 10+INT, so an INT of 10 would mean 20 points per level-up, making INT a very useful skill.
- While your Pip-Boy says the maximum number of attainable skill points per skill is 100, it also factors in hypothetical skill points. In other words, if a player has 98 skill points for Explosives, and then obtains the respective bobblehead, the game engine reads the total skill points as 108. The extra points don't actually have any effect on the skill itself, or weapon damage in this case, but the 'hypothetical' points can counter-act negative effects from adorned clothing/armor, or from addictions. Since a player cannot add more points to a maxed skill via point distribution at level-ups, the only way to get the extra points is from reading skill books or collecting bobbleheads.
- It is actually possible to kill your game if you are not careful when assigning skill points, especially with Broken Steel. It is very possible to make a character that, when level 30, has 100 skill point assigned in all 13 skills, making it impossible to distribute any more, subsequentially keeping your character at the "level up menu" permanently. The cause is using too many skill books, which boosts the skills too high.
Fallout: New Vegas
Note that 0.5's on odd intelligence level gains are saved for the next level. Example: You have 9 intelligence. First level up nets 14 points. You level again and net 15 points. In reality you gain 14.5 then 14.5, but obviously the game cannot allow you to increase a skill by 1/2.
Skill books will also permanently increase skills.
The perk Educated, available at level 4. Adds an extra 2 points per level up. This yields an extra 52 points if taken at level 4.(Addons increase level-cap, further increasing the benefit from taking the perk).
The maximum obtainable amount of skill points(without add-ons) is 489. This requires creating a character with 9 INT, taking the Educated perk at level 4, and getting the Intelligence Implant (requiring 4000 caps) before reaching level 2. An alternative is to just create a character with 10 INT. This is not recommended due to the availability of implants. Its worth noting that the difference of getting the implant sooner rather than later is of only a couple points. Getting the implant at level 9 will get you a total of 485 points. Even getting it at level 25 gets you a total of 477, only 12 short of the max. This is roughly equivalent to an extra level-up's worth of skill points if you had an average INT level.