Training Mode (トレーニング, Training), or simply Training in Brawl, is a mode available in all games of the Super Smash Bros. series where the player can manipulate overall gameplay of a match and experiment with the CPU without the restrictions of standard Versus Mode. The mode's features, behaviors, and properties vary throughout the series.
As implied by its name, Training Mode is intended to allow players to practice using characters in a non-serious setting. All matches within the mode are actually Time matches of infinite length, as seen on the Jumbotrons featured in the Pokémon Stadium stages. The player can use any character they wish and select one CPU character as their opponent. Any stages available to the player can be used in the mode, including Smash 4's Omega Form stages.
Interestingly, Stale-Move Negation is not present in the mode for Brawl or SSB4. Additionally, in SSB4, the rage mechanic is ignored and pausing while in Training Mode will freeze the stage and all such elements, but not the characters or items.
Within Training mode, a specialised UI overlay, unavailable in any other mode, is displayed on the screen in order to show data relevant to gameplay. The overlay is always present in Smash 64, Melee, and Smash 4, but is disabled by default in Brawl.
The overlay contains information regarding:
In addition to allowing players to train against an ordinarily idle opponent or to perfect their timing in combos or other advanced techniques, the player has the option of manipulating the environment of the stage or gameplay. Initially limited in Smash 64, modifiers within later games were more advanced.
Modifying the match's parameters requires using a specialised menu accessed by pressing the pause button; while this menu stops the CPU from performing actions, it does not actually pause the battle, and so items on the stage and other stage hazards can potentially harm the player while they apply modifiers. As the Nintendo 3DS has two screens, the bottom touch screen can be used to manipulate the environment without having to pause the game.
Character Loading Input Delay
In Brawl, after adding additional CPU's to a match, those CPU's do not function correctly when set to Control. It is unclear exactly what causes it, but they do not act on the same frame as another character using the same input, causing both input delays and ignored inputs. Opening and closing the training menu (by pressing the pause button) fixes this until a new CPU is added. This does not occur in Melee.
Combo Counter inaccuracy
There appears to be an issue with the combo count in Smash 4 which is demonstrated in a video by the Beefy Smash Doods, where true combos will not be displayed as combos and vice versa. This is believed to be due to the formula for hitstun being different in training mode than in a regular smash, although it may also involve not being correctly adjusted for hitstun cancelling or gravity compensation.