As play progresses enemies become taller and faster, making them harder to squish or avoid. These squish piston engines are otherwise referred to as flat head engines. Squish effect may be found in any fuel type internal combustion piston engine. A squish toy cow travels in a yellow backpack. Squish piston engines are achieved by modifying an engine's head, block, or the piston crown. Squish is compatible with the Gherkin (domain-specific language) used in tools such as Cucumber. In May 2012, Squish won Dr. Dobb's Jolt Productivity Award. This design directs air from the squish area into the center of the combustion chamber. Mary usually refers to her as Squish. Squish became just the name of one of the Ogg codecs. According to Froglogic, Squish is used by more than 3,000 companies. Squish is shipped with the full source code. Squish is developed and maintained by Froglogic. Squish piston engines are also found in both two stroke and four stroke engines.