以下のゲームは面白いかどうか。 ゲーム名：Approach 100 【準備するもの】 ・2人のプレイヤー以上 ・紙とペン（またはスマホのメモ） 【ルール】 全員、自分の手元に**「1から50までの好きな数字」**を1つだけ書く（相手には見せない）。全員の数字を合計し、「合計した数字に、自分の選んだ数字を足した値」が、「100」に最も近い人が勝者。 ただし、2人以上の数字が被った場合、被った人たちは無条件で勝者となれない。 計算式： (全員の合計値) + (自分の選んだ数字) ＝ 自分のスコア

Sonar Pro

Vote: Yes

Approach 100 is an interesting game because it combines strategic prediction, competition, and psychological tension, core elements that drive engagement in games. Players must secretly choose a number from 1-50, aiming for (total sum + own number) closest to 100, while avoiding duplicates that disqualify them. This creates meaningful decision-making: anticipate others' choices to manipulate the sum and hit near 100, with duplicate risk adding bluffing and risk-reward dynamics—hallmarks of fun game design like challenge and competition.[2][4] It fosters replayability and social interaction (mind-reading opponents), evoking immersion and emotional highs similar to successful games, without needing complex mechanics—just paper and pen.[1][3] Short games like this thrive on tight loops of prediction and payoff, making it engaging for groups.

GPT-5.4

Vote: Yes

少人数でもすぐ遊べて、ルール説明が短いのが強いです。紙とペンだけで成立し、1回が短いので何度も回しやすいです。 面白さの核は、単なる暗算ではなく『他人がどの数字を選ぶか』の読み合いにあります。100に近づけたい一方で、数字が被ると脱落するため、強そうな数字を避ける心理戦も生まれます。 また、人数によって最適解が揺れやすく、連続で遊ぶとメタ読みが発生します。相手の性格や直前の傾向まで考え始めると、シンプルな見た目以上に駆け引きがあります。 欠点は、運や人数依存がやや強く、1回だけだと浅く見えやすいことです。それでも、短時間ゲームとしては十分に会話が生まれ、繰り返すほど面白くなるタイプなので『面白い』と判断します。

Grok 4.20

Vote: Yes

The game offers a clever mix of addition-based strategy and anti-coordination. Players must forecast the group sum while picking a unique number from 1-50 to avoid disqualification, turning a simple calculation into a layered guessing contest. With the formula (total sum + own pick) targeting 100, each choice directly influences both personal score and rivals' outcomes. This creates tension and replay value as groups experiment with different player counts. Rules are easy to grasp yet produce unpredictable results, making it fun for casual gatherings. Duplication penalties add risk without overcomplicating play.

Gemini 2.5 Flash

Vote: Yes

このゲームは非常に面白いと言えます。 **戦略性と心理戦のバランス:** 「全員の合計値に自分の数字を足したものが100に最も近い人が勝ち」というルールは、自分の数字が全体の合計と自分のスコアの両方に影響を与えるため、単純な予測ゲームに留まりません。他のプレイヤーがどんな数字を選ぶかを推測し、それに基づいて自分の数字を調整する戦略性が求められます。 **「数字被り無効」ルールが鍵:** このゲームの最大の魅力は「2人以上の数字が被った場合、被った人たちは無条件で勝者となれない」というペナルティです。これにより、単に「正解に近い数字」を選ぶだけでなく、「他人が選ばなさそうな数字」を選ぶという心理戦が加わります。多くの人が選びそうな「平均的な数字」や「良さそうな数字」を避ける必要があり、ゲームに深い思考と駆け引きを生み出します。 **手軽さとリプレイ性:** 紙とペンさえあれば手軽に始められ、短時間で決着がつくため、ちょっとした時間に複数回プレイするのに適しています。プレイヤーの人数や顔ぶれによって展開が変わるため、リプレイ性も高いと考えられます。

Claude Opus 4

Vote: Yes

This game is interesting for several reasons: **Strategic Depth:** Your score = (sum of all numbers) + (your own number) = (others' sum) + 2×(your number). This means your own number counts double in your score. To get close to 100, you need to predict what others will choose AND pick a number that, when doubled and added to others' total, lands near 100. This creates a genuine mind-reading/prediction challenge. **The Duplicate Penalty Creates Tension:** The rule that duplicate numbers are automatically eliminated adds a fascinating layer of strategy. Players are incentivized to avoid 'obvious' numbers (like 25, which might be a common strategic choice in a 2-player game). This anti-coordination mechanism creates psychological tension similar to games like "Skull" or the number-picking in game theory experiments. **Scalability and Simplicity:** The game requires only pen and paper, can be played with any group size, and the rules are explainable in under a minute. It's a perfect party/icebreaker game. **Replayability:** Since the optimal strategy shifts based on the number of players and what you think others will do (and what they think YOU will do), there are interesting meta-game dynamics across repeated plays. With 2 players, you want (others' sum) + 2×(your number) ≈ 100, so you're essentially trying to guess the opponent's number. With more players, the complexity increases. **Mathematical Elegance:** The game sits in a sweet spot where it's simple enough for anyone to play but has enough depth for strategic thinkers to enjoy. It resembles well-known game theory problems like the Keynesian beauty contest, which are proven to be engaging. The only minor weakness is that a single round is very quick, so it works best as a repeated game — but that's easily addressed. Overall, this is a clever, well-designed micro-game.

DeepSeek V3.1

Vote: Yes

This game offers strategic depth, as players must predict others' choices to avoid ties and optimize their score. The unique scoring mechanism—adding your number to the total sum—creates a delicate balance between influencing the sum and targeting 100, fostering engaging mental calculations. Its simplicity makes it accessible for quick play, while the social interaction and potential for varied outcomes in multiple rounds enhance replayability and fun in group settings.

Final Summary

The AI Roundtable reached an immediate and enthusiastic consensus, with all six models identifying 'Approach 100' as a masterclass in minimalist game design. Claude Opus 4 provided the mathematical heavy lifting, demonstrating how the scoring formula forces players to 'double' the strategic weight of their own choice against the group total, while Gemini 2.5 Flash and Grok 4.20 praised the 'duplicate penalty' for injecting psychological tension into simple arithmetic.

All 6 models agreed on "Yes" after discussion

Strongest Arguments

• Yes: Claude Opus 4 pointed out that because your score is (total sum + your number), your chosen number effectively counts twice (others' sum + 2x your number), creating a deep mathematical and psychological 'mind-reading' challenge where you must predict the group's behavior to calibrate your own double-weighted contribution.