Kakuro Cross Sums - Classic is a free Android game developed by Pink Pointer that offers a modern twist on the classic math puzzle game. The objective of the game is to insert a digit from 1 to 9 inclusive into each white cell such that the sum of the numbers in each entry matches the clue associated with it and that no digit is duplicated in any entry.

This game offers a modern layout and five different difficulties, each with hundreds of puzzles to choose from. It also has an auto-save feature so that you can pick up where you left off, unlimited undo/redo, and a color input system for experts. The clean interface and smooth controls make it easy to use, and it supports both phones and tablets. Plus, it comes with Google Play Games achievements to keep you motivated.

For those who want an extra challenge, there are helpful optional features such as pencil modes, keyboard configurations, and automatic error detection. Overall, Kakuro Cross Sums - Classic is a fun and challenging game that will keep you entertained for hours on end.