the “skynet - the chasm” puzzle seems to be missing. if i remember correctly it was an easy puzzle.
it was the easy variant for “skynet - the bridge”. a hard puzzle.
https://www.codingame.com/training/hard/the-bridge-episode-2
here is a blog post hinting at the existence of “the chasm” and “the bridge”
https://www.codingame.com/blog/skynet-revolution-results-codingame/
here are some forum topics that prove that “skynet - the chasm” once existed:
https://www.codingame.com/forum/t/skynet-the-chasm-platform/1070
https://www.codingame.com/forum/t/bug-in-skynet-the-chasm/1053
https://www.codingame.com/forum/t/skynet-the-chasm-puzzle-is-not-save-my-result/312
here are forum topics suggesting that the forum topic for “the chasm” was lost in a crash
https://www.codingame.com/forum/t/database-disk-crash-lost-of-data/302/6
https://www.codingame.com/forum/t/discussion-for-skynet-the-chasm-doesnt-exist-or-is-private/329