Editing Artificial intelligence

[[File:CPUSmashU.png|thumb|right|A computer player in {{forwiiu}}, along with its selectable levels.]]

'''Artificial intelligence''', abbreviated as '''AI''', in the ''{{b|Super Smash Bros.|series}}'' series refers to the intelligence of any computer-controlled (CPU in ''Brawl'' and later, CP in ''SSB'' and ''Melee'') character (called '''computer players''' in-game) in the [[Single Player modes|single-player]] and [[Versus Mode]]s. In Versus Mode, players can preset the AI of a computer player with a level setting. In [[Adventure Mode]], [[All-Star Mode]], and [[Classic Mode]], players can still set it to some degree with the modes' difficulty setting.

Artificial intelligence levels range from 1 to 9, with 1 being the weakest and 9 being the strongest. The default CPU level in Versus matches is 3 for ''SSB'', ''Brawl'', ''Smash 4'', and ''Ultimate'', and 1 for ''Melee''. In general, the level of an AI opponent determines how likely they are to follow through with a decision, as well as how fast they react, which results in the illusion of more skill - both a level 1 and a level 9 AI will decide to do something such as input an attack, but the level 1 will almost never do so, waiting for a long time before eventually doing it, while the level 9 almost always will instantly. Likewise, lower level CPUs are unlikely to [[shield]] or [[dodge]] an attack, using [[roll]]s simply to reposition themselves in some instances, and almost never using their [[shield]] at all, or at random times in ''Brawl''. On the other hand, higher level ones almost always defend from attack, generally having good reflexes or dodging any attack when not in lag - in all games, level 9 CPUs are able to perfectly land attacks against opponents when at the appropriate range from them, and in ''Brawl'' and ''Smash 4'', they can defend against almost any attack with one-frame reactions, resulting in disproportionate [[perfect shield]]ing and [[dodging]] capabilities. Also due to this change in reflexes, low level CPUs are prone to simply standing next to their opponent and using a weak attack such as a [[neutral attack]] or [[tilt]], while high level CPUs use [[aerial attack]]s, [[smash attack]]s and [[grab]]s more prominently.

The AI's [[recovery]] also improves as their level is increased: CPUs at low levels tend to recover in a simple and predictable pattern with their [[up special]]s, or may not use them at all in ''SSB'', while high level ones in ''Brawl'' and ''Smash 4'' are capable of properly combining or alternating between different recovery techniques. For example, CPU {{SSB4|Luigi}} in ''Smash 4'' only uses his [[Super Jump Punch]] to recover at low levels (specifically Level 1 to 5), while at high levels (6-9) he also makes use of his [[Green Missile]] and [[Luigi Cyclone]].

In [[Training mode]], besides attacking, CPUs also have many other "[[List of CPU modes|modalities]]" that can be chosen, these being: Stand, Evade, Walk and Jump. When these are chosen, CPUs will act that way, allowing players to battle in different ways against them, and practice different types of techniques. In ''SSB'' and ''Melee'', these are set to a pre-determinate level (levels 3 and 1 respectively), while in ''Brawl'' and ''Smash 4'', they can be chosen from 1 to 9 from the character selection screen as usual, which also improves their reflexes. For example, level 1 CPUs on Stand will just take on whatever attack is thrown on their way, and recover in a simple and [[gimp]]able pattern, while level 9 ones will almost always air dodge after [[tumbling]] (in ''Brawl'') and will choose better recovery options. When set to Attack, CPUs will fight the player as on usual battles, but since the level cannot be selected in ''SSB'' and ''Melee'', it is somewhat unfavorable to fight CPUs on Training mode. Players instead tend to train against them on normal Versus modes. CPUs set to Attack mode in ''Smash 4''{{'}}s Training mode are also much likelier to [[spam]] projectiles and other special moves than in other modes, using them even at close range from opponents.

Certain single-player stages and [[event]]s in ''Melee'' give CPUs a level of 0, such as [[Event 19: Peach's Peril]] and [[Event 21: Ice Breaker]], in which case they don't attack at all, but still follow whatever movement behaviour they would normally have. Some also give them other specific behaviors, such as [[Event 3: Bomb-fest]] in ''Melee'' causing CPU {{SSBM|Link}} and {{SSBM|Samus}} to use their [[down special]] moves more often, and [[Event 31: The Ultimate Bodyguard]] in ''Brawl'' causing CPU {{SSBB|Zelda}} to [[crouch]] and do nothing until the stage changes a second time. In ''Melee'', these specific behaviors can be accessed via the {{SSBM|Debug Menu}}.

In ''SSB'', CPU levels appear on the [[character selection screen]] as a digit with two arrows on either side to adjust it up or down, appearing where the selected character's name would be displayed for a human. In ''Melee'', the levels are instead adjusted with a red slider which can be selected with the [[A button]] and then moved with the [[control stick]], which increases in number from left to right, above the selected CPU character's name. In ''Brawl'' and ''Smash 4'', only the level number to which the CPU is currently set is shown at first, now appearing where the option to choose a [[name]] would appear for human players; clicking the number displays a menu with the other levels, scrolled by moving the cursor up and down. In ''Smash 4'', the numbers appear with colors changing from purple to red as the level increases, while in ''Brawl'', all numbers appear in black but with an adjective to accompany each CPU level and describe its skill, namely '''Puny''', '''Wimpy''', '''Weak''', '''Normal''', '''Hardy''', '''Strong''', '''Burly''', '''Mighty''' and '''Nasty''' in ascending order.

The [[amiibo]] figures released for ''[[Super Smash Bros. 4]]'' have stored data for a CPU fighter within them. The player may [[character customization|customize]] said character and train them by having them battle. The amiibo is labeled with "FP", and can gain experience to level up after battle, capping at level 50. Battling amiibo against each other will yield more experience than battling a human or regular CPU. Additionally, the amiibo will be able change tactics after repeated battles (e.g. if the amiibo battles an opponent that shields frequently, it will learn to use its own shield more effectively and counter shielding opponents with grabs).

Training against CPUs is said to not adequately train one's skills beyond basic offense and defense (such as the ability to read and bait opponents), and it is often argued that excessive CPU training may cause a player to actually become slightly worse by developing habits that only work against CPUs and will be heavily exploited by human players. For example, if a Marth player persistently used [[Counter]] as a CPU got close to attack, it would fall for it most of the time especially at higher levels, without trying to instead bait the counter or use grabs more often, using even powerful attacks that might result in the CPU being fatally KO'd when countered. However, a skilled or even a remotely competent human player would easily avoid the move by feigning an attack in the cases where Marth would commonly use Counter, and then punish him with a grab or delayed powerful attack such as a charged smash. Another example is CPUs not avoiding or fighting off edge-guarders effectively in any of the ''Smash'' games (except ''Smash 4''), which allows players to KO them with basic edgeguarding techniques, while experienced players would prevent this at all costs. Also in ''Smash 4'', higher level CPU's (mostly levels 7-9) also have next to frame-perfect aerial dodging, only doing so when a player or CPU inputs the attack near them, or when items such as projectiles end up close enough to them. Either way, high-level CPU's always manage to pull air dodges off perfectly, and can only effectively be hit by rapid-hitting moves or through mechanics such as hitstun. This can make practicing aerial combos infuriating, especially with characters who have strong aerial games like comboing or meteors incorporated into their movesets, such as Marth, Peach, and Jigglypuff; this is further accentuated by their constant hold of the jump command while in the air (even when out of jumps), as they will, more often than not, [[Footstool Jump|phantom footstool]] the player, leaving the CPU in a favorable situation away from the player.

However, training against CPUs does have its merits. CPUs can be used to effectively practice [[combo]]s and [[chain throw]]s, as well as [[spacing]], [[punish]]ing and other [[tech skill]] related things. CPUs can be more effective than human players in this regard, as they're always available and won't refuse a match where a player just wants to practice the aforementioned things. Many top professional smashers have reported using CPUs to train, such as {{Sm|Nairo}}, {{Sm|Vinnie}}, and {{Sm|Mew2King}}.

There is, however, no consensus as to which level CPU is best to train against, with players mostly having their own personal opinion on what level is most effective. Some say level 1 CPUs are the best, as they won't have inhuman perfect shielding abilities and won't disrupt the player's training. Some say level 9 CPUs are the best, as they will actively try to fight the player and can punish mistakes the player makes. Some others say level 5 CPUs are the best for being a middle ground between the two extremes. Other players say Level 6-8 CPUs are the best for being challenging but not having inhuman reactions at the same time. Another camp maintains what level is best is dependent on what a player is trying to practice.