The Basics

Match pairs of tiles in a 2D field with as restriction that the tiles can be connected via a a route with at most two turns. There are many levels with different layouts and different sets of tiles. You can win boosters that can help you complete levels, unlock new tilesets.

Difficulty

There doesn't seem to be much increase in difficulty through the levels that I have played.

Variation

Besides more tiles and different tilesets, there seems to be very little variation between the different levels.

Free vs Paid

Unusual high number of ads, even when starting the game before you can play there is not just an ad banner at the bottom, but you are interrupted with an ad as well. Ads can be removed for a small purchase, and you can purchase in game credits as well.

Is It Any Good?

I give Onet 3D - Classic Link Puzzle 7 out of 10 stars. Conceptually nice, but does not stand out.