Lichess puzzle ratings are completely puzzling. For example this

Puzzles vs. Games - by Nate Solon - Zwischenzug

Lichess puzzles distribution by rating • page 1/1 • Lichess Feedback •

Something is off in puzzle ratings - Chess Forums

trueberryless's Blog • Partial Credit for half correct Puzzles •

SayChessClassical's Blog • Are Chess Improvers Causing a Lichess Tactic Rating Deflation? •

Getting the same training puzzles repeatedly, no score updates · Issue #813 · lichess-org/lichobile · GitHub

600 Modern Chess Puzzles (Chess Tactics) - Kindle edition by Kravtsiv, Martyn, Burgess, Graham. Humor & Entertainment Kindle eBooks @ .

How good can you get at chess by just completing puzzles, (specifically the training on Lichess app)? - Quora

Lichess 101: A Comprehensive Grandmaster Guide to Chess

CheckRaiseMate's Blog • Ratings Are Broken •

Rated Puzzles - OGS Development - Online Go Forum

Some Puzzling Analysis

Tactics don't correspond to their rating - Chess Forums