Via the SmartKit website I found an extended version of Tetravex called Lady Bird. The difference is that Lady Bird has three different levels to solve (size of game board; easy =3×3, tame 4×4 and hard 5×5), this is two more levels than Tetravex.
Object of Ladybird is the same as Tetravex; drag the nine, sixteen or even twenty-five tiles into the grid area so that any two adjacent numbers are the same. Every game has a solution. Nice kind of puzzle for a few hours of fun. Happy Puzzling!
Tags: Ladybird | Puzzle Game