The second Siouxper Bowl high school quiz bowl tournament was held on November 12, 2005, at the University of Sioux Falls under the direction of the university's Natural Science Area, its Vice President for Academic Affairs Dr. Larry Ort, and R. Robert Hentzel of National Academic Quiz Tournaments, LLC. The tournament was a qualifier for the 2006 NAQT High School National Championship.
Sixteen teams attended from eleven schools in two states (South Dakota and Iowa). The teams played six preliminary games, after which every team that was 3-3 or better advanced to single elimination playoffs for the championship. The six preliminary games were randomly determined for each school with some attempt made to minimize matches between teams from the same school.
After the preliminary games, the standings were:
| Rank | Team | Record | PPTH |
| 1 | Greater Sioux Falls Home School Association | 6-0 | 16.29 |
| 2 | Rapids City Central A | 6-0 | 13.42 |
| 3 | Sioux City North (IA) | 5-1 | 10.92 |
| 4 | Rapids City Central B | 5-1 | 8.00 |
| 5 | Roosevelt | 4-2 | 11.04 |
| 6 | Harrisburg | 4-2 | 4.38 |
| 7 | Brandon Valley A | 3-3 | 8.71 |
| 8 | Brandon Valley C | 3-3 | 6.71 |
| 9 | Central Lyon A (IA) | 3-3 | 5.58 |
| 10 | Brandon Valley B | 2-4 | 7.21 |
| 11 | Estherville (IA) | 2-4 | 6.00 |
| 12 | Central Lyon B (IA) | 2-4 | 2.75 |
| 13 | Tri-Valley | 1-5 | 3.83 |
| 14 | West Central | 1-5 | 3.54 |
| 15 | Baltic | 1-6 | 3.25 |
| 16 | Brandon Valley D | 0-6 | 3.46 |
Teams with identical records were ordered by points-scored-per-tossup-heard (PPTH).
Every team with a 3-3 or better record advanced to the playoffs. This ended up being a total of nine teams. They were seeded into a 16-team single-elimination bracket; this resulted in byes for the top 7 teams and a single first-round game between seeds #8 and #9. In that first round, Brandon Valley C (#8) defeated Central Lyon A (#9) by a score of 180-130.
In the second round, Harrisburg (#6) eked out an upset over Sioux City North (#3) 165-160, the Greater Sioux Falls Home School Association (#1) defeated Brandon Valley C (#8) 210-195, Rapids City Central A (#2) defeated Brandon Valley A (#7) 210-105, and Roosevelt (#5) toppled Rapids City Central B (#4) 220-165).
In the semifinals, the Home School Association (#1) beat Roosevelt (#5) 270-215 while Rapids City Central A (#2) took out Harrisburg (#6) 295-130.
In the championship game, the Home School Association (#1) beat Rapids City Central A (#2) 340-155. In the consolation game for third place, Roosevelt defeated Harrisburg 260-120.
Harrisburg, the fourth-place finisher overall, was also the Top Small School in attendance (by NAQT's definition).
By virtue of finishing in the top 15% of the field, the Greater Sioux Falls Home School Association, Rapid City, and Roosevelt have qualified for the national championship. Harrisburg, the Top Small School, also qualified.
The tournament also recognized individual performances; the top eight scorers by tossup-points-scored-per-tossup-heard (PPTH) during the preliminary games were:
| Rank | Name | Team | Points per game |
| 1 | Nick Truelson | GSFHSA | 92.50 |
| 2 | Joshua Swanson | Rapids City Central A | 52.50 |
| 3 | Jeff Lang | Rapids City Central B | 50.00 |
| 4 | Dan Rohlf | Brandon Valley A | 43.33 |
| 5 | Katerina Belkin | Sioux City North | 40.83 |
| 6 | Natalie Wisco | Sioux City North | 35.83 |
| 7 | Siva Kasinathan | Roosevelt | 35.00 |
| 8 | Ben Haugen | Estherville | 35.00 |
In addition, Nick Truelson (the #1 scorer overall!) of GSFHSA received a trophy for being the top sophomore scorer at the tournament, and Ryne Mathison (the #19 scorer overall) of West Central received a trophy for being the top freshman scorer at the tournament.
The tie between Siva and Ben was broken by number of power tossups. Players who competed in fewer than three games were not eligible for individual trophies.
The complete statistics for the preliminary rounds of the tournament are also available:
If you have any questions about this event or its results, please do not hesitate to contact R. Robert Hentzel.
Other documents of (potential) interest: