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What is Blueprint? Blueprint is a high level, visual scripting system that provides an intuitive, node-based interface that can be used to create any type of script events in the Unreal editor.

Inside Unreal Engine 4 (UE4) you have a few options for implementing gameplay logic: C++ Classes: Variables and functions are defined in C++ and implement the base gameplay logic. Blueprint Classes: Logic can be implemented in the Event Graph of Blueprints, or in Functions called from those graphs.

The Blueprint Visual Scripting system in Unreal Engine is a complete gameplay scripting system based on the concept of using a node-based interface to create gameplay elements from within Unreal Editor. As with many common scripting languages, it is used to define object-oriented (OO) classes or objects in the engine.

Blueprints can be 10 times slower than C++ and in larger games they can get very complex and difficult to manage. Things like using SDK's and many features require you to write code. Unreal provides you ability to convert your blueprints to C++ but if used carelessly it can cause bloating.

Blueprints is the visual scripting system inside Unreal Engine 4 and is a fast way to start prototyping your game. Instead of having to write code line by line, you do everything visually: drag and drop nodes, set their properties in a UI, and drag wires to connect.

What can you do with Blueprint?Create level script. The Level Blueprint fills the same role that Kismet did in Unreal Engine 3, and has the same capabilities.Create interactive objects.Create customizable prefabs with construction script.Create a playable game character.Create a HUD.Apr 4, 2014

Yes, you can make a game in Unreal using Blueprints as your principal gameplay code. No, it isn't without coding, Blueprints are organized as high-level programming language similar to C#, just with a node-based presentation instead of text.

While Blueprints can be quicker than C++ when it comes to creating most functionality, it can also be messier.This can make it harder to tell where certain parts of the game mechanics are located or troubleshoot errors if the mechanic isn't working properly.

Blueprints is just a language just like C++, it's also well documented and easily accessible than C++. If you choose to develop with C++, you're going to have a hard time because the documentation is very vague and learning material is scarce.

This guide from Epic gives a great introduction on how to balance both C++ with Blueprints in your project. In short, it's recommended to use C++ for general core systems and Blueprints for specific gameplay mechanics that extend those systems and need fast iteration for balancing and testing.