Place a Looney pyramid so that it points at the empty cell where the opponent must play next. Win by leaving the opponent with no legal placement.

Inventors: Pierre Berloquin, Joseph Kisenwether

See Looney Pyramids wiki: Synapse-Ice.

The locale lists a 5×6 board as default; the engine board is 6 files by 5 ranks. No other variants are selectable.

• Current engine version: 20260515 (2025-05-15). On Abstract Play since 2026-05-27.

• This version uses Icehouse pyramids on a larger board, following Joseph Kisenwether's 2005 proposal.

• https://looneypyramids.wiki/wiki/Synapse-Ice
• https://boardgamegeek.com/boardgame/58907/synapse-ice