The teenage reality stars announced the app Tuesday on Instagram. Half-sister Kim Kardashian released a game of her own, Kim Kardashian: Hollywood, in June 2014, which earned over $43 million in its first three months.
"We couldn't wait to tell you any longer!" Kendall Jenner captioned a photo of the sisters' likenesses. "Excited to announce that we are working on our own mobile game! #KendallKylieGame #staytuned."