EndLex is a daily word puzzle in which players solve ten clues and use the first and last letters of each answer to form a pool of letters. The goal is to arrange those letters into the longest possible word. Each clue can be solved at the player’s own pace, while a stopwatch runs for the full game. Players may use hints, which cost 15 points, and select or remove letters by tapping their tiles. After completing the word, the game calculates a score that can include a time bonus of up to 300 points for finishing quickly. The site also includes a daily leaderboard, a comments section, an item about events on that day in history, and a random niche fact. EndLex requires JavaScript and can be opened in Safari or Chrome, either directly or through a website link. The game clock starts when the player taps Start. The site identifies Adam Schkolne as its creator.