Board configurations vary among different games but also within variations of a given game; for example Endodoi is played on boards from 2×6 to 2×10. The largest are Tchouba (Mozambique) with a board of 160 (4×40) holes requiring 320 seeds; and En Gehé (Tanzania), played on longer rows with up to 50 pits (a total of 2×50=100) and using 400 seeds. The most minimalistic variants are Nano-Wari and Micro-Wari, created by the Bulgarian ethnologue Assia Popova. The Nano-Wari board has eight seeds in just two pits; Micro-Wari has a total of four seeds in four pits.