From @altosadventure on Twitter:

We’ve decided to make Alto’s Adventure and Alto’s Odyssey available for free for the next week to help anyone who may be practicing social distancing or self-isolation. We hope Alto and the gang can bring a little calm into your homes during these difficult times.

Link for Alto's Odyssey

These are brilliant games that I paid for and have spent plenty of time playing. Great to take your mind off things.

MacOS versions are free too (thanks mortyestmorty and brightaussie)

Alto's Adventure
Alto's Odyssey

'I couldn't let Alto's Adventure slide by me' 'Pristine and refined' 'One of the best-looking games on the App Store' Best Looking Video Games of 2015 'Satisfies the soul' 'Alto's Adventure is the endless runner matured' 'Alto’s Adventure is remarkably soothing' 'One of my favorite games' 'Alto is lovely' 'It’s seriously stunning'.

Alto's Adventure Mac Free Trial

Join Alto and his friends as they embark on an endless snowboarding odyssey. Journey across the beautiful alpine hills of their native wilderness, through neighbouring villages, ancient woodlands, and long-abandoned ruins. Download Alto's Adventure for macOS 10.9.0 or later and enjoy it on your Mac. ‎Above the placid ivory snow lies a sleepy mountain village, brimming with the promise of adventure. 'A piece of interactive art' – WIRED 'Best of 2015' and '15 Most Beautiful Games' – Apple 'Favorite Apps of 2015' – The New York Times 'One of the best mobile. Weebly’s free website builder makes it easy to create a website, blog, or online store. Find customizable templates, domains, and easy-to-use tools for any type of business website.