Added reference.
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 ** Gameplay
    * Description of original Q*bert: https://www.atarimagazines.com/cva/v1n2/qbert.php
    * NES version online: https://www.qbertflash.com/
+   * Java implementation: https://github.com/leonardo-ono/Java2DQBertGame/blob/master/src/br/ol/qbert/infra/PlayField.java
 ** Fonts
    * Share Tech Mono: https://fonts.google.com/specimen/Share+Tech+Mono?category=Monospace#license
 ** Modeling