Hot answers tagged engine
No, that's not true. It does cost that much for full professional access, but you can program and sell a game with the base free feature-set: License comparison
This usually depends. Are the sprites static? If they are, you could use a Vertex Array for storing all of your static geometry and such. I believe there is an example of this in the SFML tutorials, under Vertex Arrays. This is a great way to store maps, but it isn't always suitable for moving sprites, like the player sprite. ...
There is a free package with test automation tools provided by Unity Technologies in the Asset Store: Unity Test Tools
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