So apparently, you can't use English game cartridges on a Japanese 2ds : r/ 3DS
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:max_bytes(150000):strip_icc()/3ds-play-ds-games-1126259-FINAL-5c104850c9e77c00015d63d8.png "Are the Nintendo 3DS and 3DS XL Backward Compatible?")
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/cdn.vox-cdn.com/uploads/chorus_image/image/18563747/nintendo_2ds.0.jpg "Nintendo 2DS coming this Oct. for $129.99, plays 3DS games in 2D - Polygon")