Here are my 2 levels for the challenge :)
Levels
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The first level is based on the first level from the original Arkanoid game. It introduces 3 different types of (breakable) blocks to the player and also shows that the behaviour and the amount of hits a block takes until it’s destroyed do not depend on the block’s color (the green and purple-ish rows are destroyed after just one hit, the three rows above them take two and the white row three hits). Each block type is a prefab so it can be used in multiple levels.
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The second level just shows some sprites from Space Invaders and is there to show the level transition animation (and to complete the challenge of course ^^).
I've played around with Unity's animator and particle systems and added some nice effects like level transitions and stars for the background.