Mini games

Several mini games appear in Fallout 3, Fallout: New Vegas and Fallout 4. The most common mini games are hacking and lock picking.

Hacking
The Hacking mini game is played in order to hack into a terminal. In this mini-game, there is a list of passwords to choose from, and after a choice is made, feedback will be given on how many letters are shared between the picked option and the correct answer, it will be much like the board game "Mastermind". You get four tries to find the current password. You have the chance to remove dud passwords and to replenish your amount of tries by selecting sets of brackets, e.g. <> and [].

Lockpicking
In the lock picking mini game, you are trying to open a locked item such as an ammo box, safe, door or some other locked item. You have a screwdriver, which is a weightless item always with you, and bobby pins, that you collect throughout your journey. Every time you fail to pick a lock, by applying to much tension to the pin, you will lose/break the bobby pin you were using and have to use another one to try again.

Blackjack
Blackjack is a card game in Fallout: New Vegas, playable in any of the five working casinos. Playing 10 hands of Blackjack grants you the Double Down achievement/trophy.

Roulette
Roulette is a casino game that can be played via dialogue in Fallout and Fallout 2. In Fallout: New Vegas, players may choose to place bets on either a single number or a range of numbers, the colors red or black, or whether the number is odd or even. Playing 10 spins of roulette gives you the Little Wheel achievement/trophy.

Slots
Slots is a game that is featured in the casinos of Fallout: New Vegas. This is with the exception of the Ultra-Luxe casino. Bets can range from 1 - 200 chips.

Caravan
Caravan is a card game that can be played with many traders and locals in Fallout: New Vegas. While traveling throughout the Mojave Wasteland, you will encounter NPCs who will be available to play a game of Caravan. Ringo in Goodsprings will give the Courier a basic deck and the rulebook. A Caravan deck must consist of at least 30 cards, chosen by the player before starting the game. If the player does not have the correct amount, any attempt to play with NPCs will result in a message informing them of this fact.

Video games
Several Pip-Boy game tapes can be found across the Commonwealth. Requiring a Pip-Boy 3000 Mk IV to play, they simply pass the time and distract from the reality of a hellish post-apocalyptic wasteland.

Text-based
In Fallout 3, one can find a text based mini game named "Reign of Grelok" at the Hubrics Comics building.