Isn’t there an alternative solution to row 3 column 4? The cell to the right of the rightmost T could instead be 12 and it would also work (you just calculate all the cells on the right based on this one), or am I missing someting about how T works in 4 directions? My assumption is lbh whfg qvfgevohgr gur gbc ahzore gb gur qvtvgf bs jung lbh trg vs lbh qb n*10+o jvgu gur evtug naq yrsg bar (nygubhtu v fgvyy qba’g dhvgr haqrefgnaq jul 20 jbexf jvgu 1 naq 5 va ebj 3 pbyhza 3)