𝗖𝗵𝗮𝗼𝘀 𝗖𝗼𝗻𝘀𝘁𝗿𝘂𝗰𝘁𝗶𝗼𝗻: Divide the grid into 9 regions of orthogonally connected cells. Place the digits 1-9 once each in every row, column and region. 𝗔𝗻𝘁𝗶-𝗖𝗮𝗺𝗲𝗹: Digits separated by a camel move (in fairy chess) may not contain the same digit. A camel moves 3 steps forward and 1 step to the side. 𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝗹 𝗫-𝗦𝘂𝗺𝘀: A digit in a circle counts the number of cells it sees of its own region in its row and column combined, including itself. Region borders and elephants block vision. If given, a 2-digit number in a rectangle gives the sum of all 'seen' digits.