Proun+ is a racing game inspired by paintings by Piet Mondriaan and Wassily Kadinsky.

It was developed and published by Engine Software for iOS and Nintendo 3DS in 2014-2015.

In this game the player has to guide a ball racing along a pipe while dodging obstacles on the way.

The iOS version received "favorable" reviews, while the 3DS version received "average" reviews, according to the review aggregation website Metacritic.

[1][2] In Japan, where the latter version was ported and published by Rainy Frog under the name Loop Line Racing (ループラインレーシング, Rūpu Rain Rēshingu) on June 10, 2015, Famitsu gave it a score of 28 out of 40.