Cells can choose to eject half their mass by clicking the space bar.  While this can allow you to consume another cell, it also makes you more vulnerable to being eaten.

Gaming gallery:

Victoria Bevard
June 13, 2015
tjTODAY ranks third on the leader-board. proves to be simple yet addicting

Victoria Bevard
June 6, 2015
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The student news site of Thomas Jefferson High School for Science and Technology