Blue Planet Software (English Wikipedia)

"Profiles". Bullet-Proof Software. Archived from the original on August 23, 2000.
"Products: Personal Computers". Bullet-Proof Software. Archived from the original on August 23, 2000.
"Products: Family Computer". Bullet-Proof Software. Archived from the original on August 23, 2000.

gamefaqs.com (Global: 2,617^th place; English: 2,140^th place)

"Release Information". GameFAQs. Retrieved May 27, 2016.

gamespot.com (Global: 115^th place; English: 92^nd place)

gamefaqs.gamespot.com

"Bakuto Dochers". GameSpot. Retrieved May 27, 2016.

giantbomb.com (Global: 3,185^th place; English: 2,451^st place)

"Faceball 2000 (Game)". Giant Bomb. Retrieved May 27, 2016.

harddrop.com (Global: low place; English: low place)

"New CEO for BPS--Henk Rogers Becomes Chairman". Harddrop.com. February 21, 2014. Archived from the original on March 14, 2016.

hawaii.edu (Global: 1,313^th place; English: 884^th place)

"Henk Rogers: From Tetris to clean energy | Malamalama, The Magazine of the University of Hawai'i System". www.hawaii.edu. Retrieved August 4, 2026.

ign.com (Global: 48^th place; English: 38^th place)

"Hasbro Goes Tetris". IGN. February 25, 1999. Retrieved August 4, 2026.
"Tetris 64 Unveiled". IGN. January 26, 1999. Retrieved August 4, 2026.
"THQ Gets Tetris". IGN. October 14, 2000. Retrieved August 4, 2026.

infinityretro.com (Global: low place; English: low place)

jeremy1456 (May 9, 2026). "Faceball 2000 Review (Game Boy, 1991)". Infinity Retro. Retrieved August 4, 2026.{{cite web}}: CS1 maint: numeric names: authors list (link)
jeremy1456 (March 9, 2026). "Faceball 2000 Review (Super Nintendo, 1992)". Infinity Retro. Retrieved August 4, 2026.{{cite web}}: CS1 maint: numeric names: authors list (link)

itmedia.co.jp (Global: 670^th place; English: 3,377^th place)

nlab.itmedia.co.jp

"ビーピーエスが日本法人閉鎖を正式に発表……". SoftBank Games. February 22, 2001.

plusd.itmedia.co.jp

"SBG:ビーピーエスが日本法人閉鎖を正式に発表……". plusd.itmedia.co.jp. Archived from the original on September 29, 2007. Retrieved August 4, 2026.

megalodon.jp (Global: 855^th place; English: 1,189^th place)

"Corporate Bios". Tetris.com. Tetris Holding LLC. Archived from the original on February 22, 2026. Retrieved February 22, 2026.

nintendoworldreport.com (Global: 2,340^th place; English: 1,271^st place)

"History of Nintendo Software Technology - Feature". Nintendo World Report. Retrieved August 4, 2026.

tetris.com (Global: low place; English: low place)

"Corporate Bios". Tetris.com. Tetris Holding LLC. Archived from the original on February 22, 2026. Retrieved February 22, 2026.
"Henk Rogers Shares His Incredible Journey In New Book: The Perfect Game - Tetris: From Russia With Love". Tetris. Retrieved August 4, 2026.
"Call Us Tetris". The Tetris Company. October 21, 2020. Archived from the original on January 17, 2021. Retrieved August 26, 2023.

tozaigames.com (Global: low place; English: low place)

global.tozaigames.com

"Tozai Games - About". global.tozaigames.com. Retrieved August 4, 2026.

web.archive.org (Global: 1^st place; English: 1^st place)

"SBG:ビーピーエスが日本法人閉鎖を正式に発表……". plusd.itmedia.co.jp. Archived from the original on September 29, 2007. Retrieved August 4, 2026.
"Profiles". Bullet-Proof Software. Archived from the original on August 23, 2000.
"New CEO for BPS--Henk Rogers Becomes Chairman". Harddrop.com. February 21, 2014. Archived from the original on March 14, 2016.
"Call Us Tetris". The Tetris Company. October 21, 2020. Archived from the original on January 17, 2021. Retrieved August 26, 2023.
"Products: Personal Computers". Bullet-Proof Software. Archived from the original on August 23, 2000.
"Products: Family Computer". Bullet-Proof Software. Archived from the original on August 23, 2000.
"Blue Planet Software - Games". www.blueplanetsoftware.com. Archived from the original on June 19, 2000. Retrieved August 30, 2025.

Blue Planet Software (English Wikipedia)

archive.org (Global: 6^th place; English: 6^th place)

blueplanetsoftware.com (Global: low place; English: low place)

bps.co.jp (Global: low place; English: low place)

gamefaqs.com (Global: 2,617^th place; English: 2,140^th place)

gamespot.com (Global: 115^th place; English: 92^nd place)

gamefaqs.gamespot.com

giantbomb.com (Global: 3,185^th place; English: 2,451^st place)

harddrop.com (Global: low place; English: low place)

hawaii.edu (Global: 1,313^th place; English: 884^th place)

ign.com (Global: 48^th place; English: 38^th place)

infinityretro.com (Global: low place; English: low place)

itmedia.co.jp (Global: 670^th place; English: 3,377^th place)

nlab.itmedia.co.jp

plusd.itmedia.co.jp

megalodon.jp (Global: 855^th place; English: 1,189^th place)

nintendoworldreport.com (Global: 2,340^th place; English: 1,271^st place)

tetris.com (Global: low place; English: low place)

tozaigames.com (Global: low place; English: low place)

global.tozaigames.com

web.archive.org (Global: 1^st place; English: 1^st place)

x.com (Global: 58^th place; English: 125^th place)

youtube.com (Global: 13^th place; English: 14^th place)

m.youtube.com

Blue Planet Software (English Wikipedia)

archive.org (Global: 6th place; English: 6th place)

blueplanetsoftware.com (Global: low place; English: low place)

bps.co.jp (Global: low place; English: low place)

gamefaqs.com (Global: 2,617th place; English: 2,140th place)

gamespot.com (Global: 115th place; English: 92nd place)

gamefaqs.gamespot.com

giantbomb.com (Global: 3,185th place; English: 2,451st place)

harddrop.com (Global: low place; English: low place)

hawaii.edu (Global: 1,313th place; English: 884th place)

ign.com (Global: 48th place; English: 38th place)

infinityretro.com (Global: low place; English: low place)

itmedia.co.jp (Global: 670th place; English: 3,377th place)

nlab.itmedia.co.jp

plusd.itmedia.co.jp

megalodon.jp (Global: 855th place; English: 1,189th place)

nintendoworldreport.com (Global: 2,340th place; English: 1,271st place)

tetris.com (Global: low place; English: low place)

tozaigames.com (Global: low place; English: low place)

global.tozaigames.com

web.archive.org (Global: 1st place; English: 1st place)

x.com (Global: 58th place; English: 125th place)

youtube.com (Global: 13th place; English: 14th place)

m.youtube.com

archive.org (Global: 6^th place; English: 6^th place)

gamefaqs.com (Global: 2,617^th place; English: 2,140^th place)

gamespot.com (Global: 115^th place; English: 92^nd place)

giantbomb.com (Global: 3,185^th place; English: 2,451^st place)

hawaii.edu (Global: 1,313^th place; English: 884^th place)

ign.com (Global: 48^th place; English: 38^th place)

itmedia.co.jp (Global: 670^th place; English: 3,377^th place)

megalodon.jp (Global: 855^th place; English: 1,189^th place)

nintendoworldreport.com (Global: 2,340^th place; English: 1,271^st place)

web.archive.org (Global: 1^st place; English: 1^st place)

x.com (Global: 58^th place; English: 125^th place)

youtube.com (Global: 13^th place; English: 14^th place)