The latest issue of Weekly Famitsu features a list of the top 100 selling games for the first half of this year. These only reflect sales from 12/29/97 to 6/28/98. Figures are compiled by Famitsu, based on reports from retail shops. It's only an estimate, not actual sales figures. In Japan, there is no organization like the NPD in the US (which provides TRSTS sales info) for video games.
Here's the list:
1. Bio Hazard 2/Resident Evil 2PSCapcom2,133,846
2. Gran TurismoPSSCEI1,340,168
3. Tekken 3PSNamco1,137,701
4. Parasite EvePSSquare956,461
5. XenogearsPSSquare885,474
6. World Soccer Jikkyou Winning Eleven 3PSKonami540,392
7. Chocobo no Fushigina DungeonPSSquare513,673
8. Sakura Taisen 2SSSega501,066
9. Super Robot Taisen F: ConclusionSSBanpresto498,009
10. Densya de Go!PSTaito467,670
It's interesting to note that there are no N64 titles on this list. So based on the figures on this list, it's assumed that no N64 title has sold above Densha de Go!