I used the Sketch "Delicious" free UI Kit for a food recipes app. It includes 11 pixel-perfect screens. I just added Proto.io interactions and created a great prototype! This Delicious UI Kit was designed by Robert Anitei Sketch source: https://www.sketchappsources.com/free-source/1765-delicious-ui-kit-sketch-freebie-resource.html

A project which simulates a collision between 2 objects. Freely drag the objects onto each other in order to have their core color change when colliding.

A basic mockup of a sign-up/sign in screens along with a 2-way authentication of a uniquely generated code each time.

A simple recreation of the very popular video game Tetris. Use the buttons to move, rotate and change the block pieces. You can also use the arrows and A,B keys on your keyboard as well. Design inspired by: https://www.sketchappsources.com/free-source/3559-grdk-pro-game-system-64bit-sketch-freebie-resource.html I do not own anything related to Tetris and this is simply a very simple tribute to the creation of Alexey Pajitnov.