Instructions
Press the "8" key on your keyboard to select the syringe from the tools menu or click the syringe icon at the top of the screen. Move your mouse or touch the touch screen to move the syringe.
Position the syringe straight up and down with the needle pointing down. Click and hold down the right mouse button while moving the cursor carefully up the center of the syringe to the bull's-eye at the top. If playing on the iPhone or iPod, tap and press down, moving your finger up the center of the syringe.
Upgrade the syringe. The first-time a surgery is successfully completed, a tool can be upgraded. Each tool can be upgraded twice. Upgrading the syringe will make it more effective and easier to navigate.