At BotBrain we know that Merkur is great for building robots. Here are some of ours and some by others.

Hexapod Robot
Uses 12 servos to walk like an insect.

Remotely Piloted Vehicle (RPV). Radio controlled, camera has view of gripper. Current versions use our Wireless Interface and a BotBrain board.

Photovore (light seeking robot). Has rear wheel caster. Because caster is tilted, bot did not steer well. A ball caster would be better.

Walking Robot, based on the Parallax "Toddler"
Uses 2 servos for walking & 1 to swing arms and rotate head.

Tracked Minesweeper, student built, uses bump, back & turn strategy and sets off mines by driving over them. The same design could easily do a maze.

4WD robot with platform for mounting sensors.

Bridge Crane
Not a robot, strictly speaking. this is a motorized update of a Merkur crane design.

Antares Rover by Raj who says: "Antares was built mostly using Merkur (95% of the parts), for some I used other parts though I could've stuck with Merkur, no particular reason though. None of the parts are permanently glued. That was a big design goal I had.  I must be able to put the Merkur parts back in the box!"

Antares Rover front view showing rotating IR sensor 'turret' and mini ball caster. See VIDEO of the rover.

Antares Rover showing detail of motors. Note the sticky "tire" which compensates for the slipperiness of the Merkur tractor tires.

Mobile Bot
This is a clever use of Merkur standard parts to make a sophisticated robot.

Front Mobile Bot
Note the bumper design.

Detail of Mobile Bot
Note the encoder

Detail of Mobile Bot
Note the standard Merkur motors for accurate dead reckoning.

Tracked Robot with Gripper
A beautiful piece of engineering and workmanship.

Tracked Robot being demonstrated. This one, the bridge crane and the Mobile Bot come to us from merkurtoys.cz, which has a lot more great pictures.