Lexicon Delta is the thirteenth of Puzzle mode's seventeen planets. It becomes available when any four of Sequentus Beta's five puzzles have been solved. The puzzles of Lexicon Delta are arranged in 6-by-6 square formations and in various patterns. Every puzzle contains a different yet limited number of basic gem types, which ranges from two to four. The fourth puzzle also has Rocks. Completing any four of Lexicon Delta's five puzzles unlocks access to Gaean Reach, the next planet in Puzzle mode.