This set of wooden packing puzzles range from difficult to unbelieveable to genius.  Give them out to the group and forget to mention the different levels of difficulty.  This will truly demonstrate how your teams perform under pressure.

Raise awareness about your team's assumptions and pre-conceptions.  Challenging Assumptions poses a dilema to your team and can only be solved if they do not think in a different way.  Each Challenging Assumptions Toolbox contains two puzzles for two groups of 3-6 learners
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Team Balance is a particularly versatile, experiential team activity that can be used in support of a wide variety of learning objectives.
The activity builds through a series of increasingly challenging tasks that make demands on the co-ordination and co-operation of all the team members. There are opportunities to review and apply learning at all stages and involvement in the whole series of exercises gives practical experience of engaging in a process of on-going improvement.
Learning outcomes

Vectorsphere is a kaleidoscope for the hands.  When any part is touch the entire structure ripples with movement, like throwing a stone into a spherical pond.  disconnect at two joints, fold it inside out like a sock, and reconnect to create a new transforming object.
Makes a great talking point sitting on your desk or waiting area.

Tantrix puzzles are guaranteed to get your mind in a twist!
Your aim is to build loops of various shapes and sizes, starting with just three tiles.
You may not find the first loop hard ... but only the best can solve all ten!

Selection of four wooden dot puzzles of varying degrees of difficulty.  All come in with wooden cases ideal for keeping all the pieces together. 1 - Place the wooden tiles in the tray so the colours of all the adjacent spots match. 2 - Rotate the wooden tiles in the tray until the colours of all adjacent spots match. 3 - Slide the wooden blocks within their tray to solve the puzzle on the reverse. 4 - Place the four blocks in the tray so that one spot of each colour appears on all four sides.

Selection of four wooden dot puzzles of varying degrees of difficulty.  All come in with wooden cases ideal for keeping all the pieces together.
1 - Place the wooden tiles in the tray so the colours of all the adjacent spots match.
2 - Rotate the wooden tiles in the tray until the colours of all adjacent spots match.
3 - Slide the wooden blocks within their tray to solve the puzzle on the reverse.
4 - Place the four blocks in the tray so that one spot of each colour appears on all four sides.

Four Pocket Wooden Puzzles - set of four assorted puzzles with differing levels of difficulty.  Ideal infill in the training room or scatter about the waiting areas.
 

Column Cube Puzzle, remove the columns from the cube, now can you get them all back in.  Appeals to the more methodical.  Demands high level of patience.

The complete set of six Impuzzables available for your training, meeting rooms and waiting areas.  Impuzzables are cubes with different levels of difficulty - fit the segments together to create a cube.
Mellow Yellow, OK Orange, Mean Green, Rough Red, Baffling Blue, Perfect White.