InSANDity by Fat Brain Toys

Flip fast to run out the clock!
Each sand timer is filled with a different amount of sand. Set the clocks to however long you want the game to last and then start the game by pressing your time button and flipping all the sand timers over.
Using one hand, you've got to keep the sand flowing by flipping and moving the timers to an empty space one at a time.
Stay focused and move fast... The instant a timer runs out, your opponent gets to hit their button to stop your time and start theirs before jumping right into the sand-flippin' action.
Whoever can run out their clock first wins the game!
Test your concentration and reflexes against the harsh judgment of time with the intense, fast-paced game of InSANDity.
InSANDity
Game of flipping sand timers to try and keep them all flowing the longest
Encourages concentration, quick thinking, hand-eye coordination, fast reflexes
Clocks can be set in 30-second increments
Game starts with one player pressing their button
On their turn, players keep flipping the timers to try and keep the sand flowing
If one sand timer runs out, other player presses their button, their turn begins
Your time only counts down during your turn
First player to run out their clock wins the game
Includes 5 sand timers, 2 sand timer trays, digital timer device
Detailed game rules and instructions included
Requires 3 AAA batteries - Not included
High-quality materials and construction - Lasting durability, exceptional gameplay
Ages 8 and up.