As you develop your games, copy generic components and methods into a common library. You can then export this as a Unity package and import it into other projects. It also encourages a component approach to your coding.

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The MenuItem attribute can also be used to create a menu hierarchy and assign a key shortcut for your editor tools. % = Ctrl; # = Shift; & = Alt; _ = no modifier. See https://docs.unity3d.com/ScriptReference/MenuItem.html


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Setting Time.timeScale to 0 is an easy way to pause your game, but make sure your UI code doesn't rely on Time.deltaTime or WaitForSeconds(). Use Time.unscaledDeltaTime to avoid this issue
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Did you know that you can have multiple scenes open in the Unity editor? Just drag your additional scenes into the hierarchy. Only one scene can be active. An easy way to compare scenes.


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Use the Ctrl key to snap game objects in your scene to the grid. Change snap units in Edit / Grid and Snap Settings. You can also toggle Grid Snapping when in Global handle rotation mode

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Use the ExecuteInEditMode attribute on your MonoBehaviour if you want any code to run while in edit mode, in addition to play mode. Update is only called when something changes in the scene

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You can easily customize the mouse cursor in your game by calling Cursor.SetCursor, using a texture of your choice. KenneyNL has a great free set of crosshairs https://kenney.nl/assets/crosshair-pack



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Use the DisallowMultipleComponent attribute to prevent multiple instances of the same component being attached. You can then call GetComponent without having to worry if more than one component is attached


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Use Debug.DrawRay and Debug.DrawLine methods to visually debug raycasts, trigger boxes and other elements in your game

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Accidentally change component values during play mode? Click the drop-down menu (top-right of the component) and click Copy Component. Then, click Paste Component Values once you're back in editor mode

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Use StringBuilder when performing a lot (>3) of string concatenation. Strings are immutable and concatenation results in copies. String interpolation can also be faster than String.Format


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You can adjust stack trace logging at runtime. E.g. call Application.SetStackTraceLogType(LogType.Log, StackTraceLogType.None) and Debug.Log will not output the stack trace


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Implement OnValidate() to limit the range of values your properties accept in the inspector

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Use the FormerlySerializedAs attribute if you need to change a property on a MonoBehaviour but don't want to lose existing values.


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