These thin but long challenges lie between the blocks. Any shape that has jagged, prickly, diagonal or peaked features might help generate the thorn. It depends on you what look Geometry Free you want for your thorns and create the same. To improve their look and game difficulty, you may also include the thorns with animated effects. Among the most typically occurring difficulties is spike. Although they may have obvious color, spikes usually have different appearance and tint. To push oneself at a certain level, one may set spikes either individually or in groups.
